Updating README to include Rails 4 support as of version 0.4.0.
fix mysql import error. uninitialized constant ActiveRecord::Import::ValueSetsBytesParser
Merge pull request #109 from masato-hi/fix-mysql-value-sets-parser

fix mysql import error. uninitialized constant.
Updating references from ValuesSets* to ValueSets*.

[#109]
Remove unnecessary debugger call.
Bumping to 0.4.1
Rename RAILS_VERSION to AR_VERSION since we don't actually care about Rails – just activerecord.
Merge remote-tracking branch 'upstream/master' into update_from_remote