Add templates for Emails on push

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/mailers/emails/projects.rb

@@ -16,7 +16,7 @@ module Emails
 
     def repository_push_email(project_id, recipient, branch, compare)
       @project = Project.find project_id
-      @commits = compare.commits
+      @commits = Commit.decorate compare.commits
       @commit  = compare.commit
       @diffs   = compare.diffs
       @branch  = branch

app/views/notify/repository_push_email.html.haml

+%h3 New push to #{@branch} at #{@project.name_with_namespace}
+
+%h4 Commits:
+
+%ul
+  - @commits.each do |commit|
+    %li
+      #{commit.short_id} - #{commit.title}
+
+%h4 Diff:
+- @diffs.each do |diff|
+  %li
+    %strong
+      - if diff.old_path == diff.new_path
+        = diff.new_path
+      - elsif diff.new_path && diff.old_path
+        #{diff.old_path} → #{diff.new_path}
+      - else
+        = diff.new_path || diff.old_path
+    %hr
+    %pre
+      = diff.diff
+    %br

app/views/notify/repository_push_email.text.haml

+New push to #{@branch} at #{@project.name_with_namespace}
+
+\
+Commits:
+- @commits.each do |commit|
+  #{commit.short_id} - #{truncate(commit.title, length: 40)}
+\
+\
+Diff:
+- @diffs.each do |diff|
+  \
+  \=====================================
+  - if diff.old_path == diff.new_path
+    = diff.new_path
+  - elsif diff.new_path && diff.old_path
+    #{diff.old_path} → #{diff.new_path}
+  - else
+    = diff.new_path || diff.old_path
+  \=====================================
+  = diff.diff