Support for release candidates in the version.json file; propagates up through the version string everywhere: filenames, ZIP, source code

tasks/build_dist.rb

@@ -30,6 +30,7 @@ task :write_version_file do
   scope = OpenStruct.new(:major => version_hash["major"],
                          :minor => version_hash["minor"],
                          :build => version_hash["build"],
+                         :rc => version_hash["rc"],
                          :revision => Time.now.to_i)
 
   File.open('src/version.js', 'w+') do |f|

tasks/helpers.rb

@@ -29,7 +29,9 @@ def console_specfiles
 end
 
 def version_string
-  "#{version_hash['major']}.#{version_hash['minor']}.#{version_hash['build']}"
+  version = "#{version_hash['major']}.#{version_hash['minor']}.#{version_hash['build']}"
+  version += ".rc#{version_hash['rc']}" if version_hash['rc']
+  version
 end
 
 def version_hash