Use Rubygems versioning instead of Versionomy.

Since we are already using Rubygems for other things, it seems better to
avoid having the dependency on Versionomy.

Gemfile

@@ -44,7 +44,6 @@ group :test do
   gem 'mocha', :require => false
   gem 'test_track'
   gem 'timecop'
-  gem 'versionomy'
   gem 'webmock'
 end
 

Gemfile.lock

@@ -69,7 +69,6 @@ GEM
       multi_json (~> 1.0)
     addressable (2.2.6)
     arel (2.2.1)
-    blockenspiel (0.4.3)
     boomerang-rails (0.0.2)
       rails (~> 3.0)
     builder (3.0.0)
@@ -253,8 +252,6 @@ GEM
       execjs (>= 0.3.0)
       multi_json (>= 1.0.2)
     validates_email_format_of (1.5.3)
-    versionomy (0.4.1)
-      blockenspiel (>= 0.4.1)
     warden (1.1.0)
       rack (>= 1.0)
     webmock (1.7.8)
@@ -303,5 +300,4 @@ DEPENDENCIES
   transitions
   uglifier
   validates_email_format_of
-  versionomy
   webmock

lib/tasks/test_javascript.rake

@@ -4,13 +4,11 @@ namespace :test do
 
   desc "Run javascript tests"
   task :javascript => :environment do
-    require 'versionomy'
-
-    minimum_supported_version = Versionomy.parse("1.3.0")
-    phantomjs_version = Versionomy.parse(`phantomjs --version`.strip) rescue nil
-    unless phantomjs_version && (phantomjs_version >= minimum_supported_version)
+    phantomjs_requirement = Gem::Requirement.new(">= 1.3.0")
+    phantomjs_version = Gem::Version.new(`phantomjs --version`.strip) rescue Gem::Version.new("0.0.0")
+    unless phantomjs_requirement.satisfied_by?(phantomjs_version)
       STDERR.puts "Your version of phantomjs (v#{phantomjs_version}) is not compatible with the current phantom-driver.js."
-      STDERR.puts "Please upgrade your version of phantomjs to at least #{minimum_supported_version} and re-run this task."
+      STDERR.puts "Please upgrade your version of phantomjs to #{phantomjs_requirement} and re-run this task."
       exit 1
     end