Use main ice_cube gem now feature is merged

Gemfile

@@ -41,7 +41,7 @@ gem 'whenever', require: false # For defining cronjobs, see config/schedule.rb
 gem 'protected_attributes'
 gem 'ruby-units'
 gem 'attribute_normalizer'
-gem 'ice_cube', github: 'wvengen/ice_cube', branch: 'issues/50-from_ical-rebased' # fork until merged
+gem 'ice_cube', '~> 0.13.0'
 gem 'recurring_select'
 gem 'roo', '~> 1.13.2'
 gem 'spreadsheet'

Gemfile.lock

@@ -22,13 +22,6 @@ GIT
     acts_as_versioned (0.6.0)
       activerecord (>= 3.0.9)
 
-GIT
-  remote: git://github.com/wvengen/ice_cube.git
-  revision: addacaab715c70c5a9b736767ae98032e8efab92
-  branch: issues/50-from_ical-rebased
-  specs:
-    ice_cube (0.12.1)
-
 PATH
   remote: plugins/messages
   specs:
@@ -197,6 +190,7 @@ GEM
       i18n (~> 0.6)
     i18n-spec (0.6.0)
       iso
+    ice_cube (0.13.0)
     interception (0.5)
     iso (0.2.1)
       i18n
@@ -500,7 +494,7 @@ DEPENDENCIES
   haml-rails
   i18n-js (~> 3.0.0.rc8)
   i18n-spec
-  ice_cube!
+  ice_cube (~> 0.13.0)
   inherited_resources!
   jquery-rails
   kaminari