Ensure Rails does not set a default value for text columns. Fixes #137.
use Array#include? instead of Object#in?

`Object#in?` is implemeted on Rails 3.1.x or later version.
Use rapns on Rails 3.0.x, occur "No method error".
Merge pull request #138 from yoppi/rails-3.0.x-compatibility

Fix error in GCM notification failed on Rails 3.0.x
Lock to Rails 3.2
Prep for release.
3.3.2
README tweak [ci skip]
[hotfix] Correct broken link to Reflection API documentation.
Merge pull request #139 from Zeeraw/patch-1

[hotfix] Correct broken link to Reflection API documentation.
Test with Rails 4
Merge branch 'rails4'
Add note about Canonical IDs [ci skip]
Do not use attr_accessible with Rails 4
Respect BUNDLE_GEMFILE
Fixes for Rails 4
SQLite3Adapter error
Lower required coverage %
Exclude jruby-19mode from testing Rails 4.
Exclude rbx-19mode from testing Rails 4 - slooowwwww [ci skip]
Allow rbx to fail