gem version tightening & updates

Gemfile

 source "http://rubygems.org"
 
 group :development, :test do
-  gem 'guard'
-  gem 'guard-rspec'
+  gem 'guard', '~> 1.5.0'
+  gem 'guard-rspec', '~> 2.1.0'
+  gem 'listen', '~> 0.5.0'
   gem 'rspec', '~> 2.14.0'
   gem 'rubocop', '0.49.1', require: false
-  gem 'simplecov', require: false
-  gem 'vcr'
-  gem 'webmock'
+  gem 'simplecov', '~> 0.9.0', require: false
+  gem 'vcr', '~> 2.4.0'
+  gem 'webmock', '~> 1.9.0'
 end

Gemfile.lock

 GEM
   remote: http://rubygems.org/
   specs:
-    addressable (2.3.2)
+    addressable (2.5.2)
+      public_suffix (>= 2.0.2, < 4.0)
     ast (2.4.0)
-    coderay (1.0.8)
-    crack (0.3.2)
-    diff-lcs (1.2.5)
+    coderay (1.1.2)
+    crack (0.4.3)
+      safe_yaml (~> 1.0.0)
+    diff-lcs (1.3)
     docile (1.1.5)
     guard (1.5.4)
       listen (>= 0.4.2)
@@ -16,20 +18,20 @@ GEM
       guard (>= 1.1)
       rspec (~> 2.11)
     listen (0.5.3)
-    lumberjack (1.0.2)
-    method_source (0.8.1)
-    multi_json (1.10.1)
+    lumberjack (1.0.13)
+    method_source (0.9.0)
+    multi_json (1.13.1)
     parallel (1.12.1)
-    parser (2.5.0.2)
+    parser (2.5.1.2)
       ast (~> 2.4.0)
-    powerpack (0.1.1)
-    pry (0.9.10)
-      coderay (~> 1.0.5)
-      method_source (~> 0.8)
-      slop (~> 3.3.1)
+    powerpack (0.1.2)
+    pry (0.11.3)
+      coderay (~> 1.1.0)
+      method_source (~> 0.9.0)
+    public_suffix (3.0.2)
     rainbow (2.2.2)
       rake
-    rake (12.3.0)
+    rake (12.3.1)
     rspec (2.14.1)
       rspec-core (~> 2.14.0)
       rspec-expectations (~> 2.14.0)
@@ -46,30 +48,31 @@ GEM
       ruby-progressbar (~> 1.7)
       unicode-display_width (~> 1.0, >= 1.0.1)
     ruby-progressbar (1.9.0)
-    simplecov (0.9.1)
+    safe_yaml (1.0.4)
+    simplecov (0.9.2)
       docile (~> 1.1.0)
       multi_json (~> 1.0)
-      simplecov-html (~> 0.8.0)
-    simplecov-html (0.8.0)
-    slop (3.3.3)
-    thor (0.19.1)
-    unicode-display_width (1.3.0)
+      simplecov-html (~> 0.9.0)
+    simplecov-html (0.9.0)
+    thor (0.20.0)
+    unicode-display_width (1.4.0)
     vcr (2.4.0)
-    webmock (1.9.0)
+    webmock (1.9.3)
       addressable (>= 2.2.7)
-      crack (>= 0.1.7)
+      crack (>= 0.3.2)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  guard
-  guard-rspec
+  guard (~> 1.5.0)
+  guard-rspec (~> 2.1.0)
+  listen (~> 0.5.0)
   rspec (~> 2.14.0)
   rubocop (= 0.49.1)
-  simplecov
-  vcr
-  webmock
+  simplecov (~> 0.9.0)
+  vcr (~> 2.4.0)
+  webmock (~> 1.9.0)
 
 BUNDLED WITH
-   1.16.1
+   1.16.2