Remove "Multiselect Blob" feature specs

These are well covered by the new Jasmine tests, and faster!

features/project/source/multiselect_blob.feature

-Feature: Project Source Multiselect Blob
-  Background:
-    Given I sign in as a user
-    And I own project "Shop"
-    And I visit ".gitignore" file in repo
-
-  @javascript
-  Scenario: I click line 1 in file
-    When I click line 1 in file
-    Then I should see "L1" as URI fragment
-    And I should see line 1 highlighted
-
-  @javascript
-  Scenario: I shift-click line 1 in file
-    When I shift-click line 1 in file
-    Then I should see "L1" as URI fragment
-    And I should see line 1 highlighted
-
-  @javascript
-  Scenario: I click line 1 then click line 2 in file
-    When I click line 1 in file
-    Then I should see "L1" as URI fragment
-    And I should see line 1 highlighted
-    Then I click line 2 in file
-    Then I should see "L2" as URI fragment
-    And I should see line 2 highlighted
-
-  @javascript
-  Scenario: I click various line numbers to test multiselect
-    Then I click line 1 in file
-    Then I should see "L1" as URI fragment
-    And I should see line 1 highlighted
-    Then I shift-click line 2 in file
-    Then I should see "L1-2" as URI fragment
-    And I should see lines 1-2 highlighted
-    Then I shift-click line 3 in file
-    Then I should see "L1-3" as URI fragment
-    And I should see lines 1-3 highlighted
-    Then I click line 3 in file
-    Then I should see "L3" as URI fragment
-    And I should see line 3 highlighted
-    Then I shift-click line 1 in file
-    Then I should see "L1-3" as URI fragment
-    And I should see lines 1-3 highlighted
-    Then I shift-click line 5 in file
-    Then I should see "L1-5" as URI fragment
-    And I should see lines 1-5 highlighted
-    Then I shift-click line 4 in file
-    Then I should see "L1-4" as URI fragment
-    And I should see lines 1-4 highlighted
-    Then I click line 5 in file
-    Then I should see "L5" as URI fragment
-    And I should see line 5 highlighted
-    Then I shift-click line 3 in file
-    Then I should see "L3-5" as URI fragment
-    And I should see lines 3-5 highlighted
-    Then I shift-click line 1 in file
-    Then I should see "L1-3" as URI fragment
-    And I should see lines 1-3 highlighted
-    Then I shift-click line 1 in file
-    Then I should see "L1" as URI fragment
-    And I should see line 1 highlighted
-
-  @javascript
-  Scenario: I multiselect lines 1-5 and then go back and forward in history
-    When I click line 1 in file
-    And I shift-click line 3 in file
-    And I shift-click line 2 in file
-    And I shift-click line 5 in file
-    Then I should see "L1-5" as URI fragment
-    And I should see lines 1-5 highlighted
-    Then I go back in history
-    Then I should see "L1-2" as URI fragment
-    And I should see lines 1-2 highlighted
-    Then I go back in history
-    Then I should see "L1-3" as URI fragment
-    And I should see lines 1-3 highlighted
-    Then I go back in history
-    Then I should see "L1" as URI fragment
-    And I should see line 1 highlighted
-    Then I go forward in history
-    And I go forward in history
-    And I go forward in history
-    Then I should see "L1-5" as URI fragment
-    And I should see lines 1-5 highlighted

features/steps/project/source/multiselect_blob.rb

-class Spinach::Features::ProjectSourceMultiselectBlob < Spinach::FeatureSteps
-  include SharedAuthentication
-  include SharedProject
-  include SharedPaths
-
-  class << self
-    def click_line_steps(*line_numbers)
-      line_numbers.each do |line_number|
-        step "I click line #{line_number} in file" do
-          find("#L#{line_number}").click
-        end
-
-        step "I shift-click line #{line_number} in file" do
-          script = "$('#L#{line_number}').trigger($.Event('click', { shiftKey: true }));"
-          execute_script(script)
-        end
-      end
-    end
-
-    def check_state_steps(*ranges)
-      ranges.each do |range|
-        fragment = range.kind_of?(Array) ? "L#{range.first}-#{range.last}" : "L#{range}"
-        pluralization = range.kind_of?(Array) ? "s" : ""
-
-        step "I should see \"#{fragment}\" as URI fragment" do
-          expect(URI.parse(current_url).fragment).to eq fragment
-        end
-
-        step "I should see line#{pluralization} #{fragment[1..-1]} highlighted" do
-          ids = Array(range).map { |n| "LC#{n}" }
-          extra = false
-
-          highlighted = page.all("#tree-content-holder .highlight .line.hll")
-          highlighted.each do |element|
-            extra ||= ids.delete(element[:id]).nil?
-          end
-
-          expect(extra).to be_false and ids.should be_empty
-        end
-      end
-    end
-  end
-
-  click_line_steps *Array(1..5)
-  check_state_steps *Array(1..5), Array(1..2), Array(1..3), Array(1..4), Array(1..5), Array(3..5)
-
-  step 'I go back in history' do
-    go_back
-  end
-
-  step 'I go forward in history' do
-    go_forward
-  end
-
-  step 'I click on ".gitignore" file in repo' do
-    click_link ".gitignore"
-  end
-end