Update Rails 4 versions to use 3.0.x branch of awesome_nested_set.  Fix bad rspec version in Gemfile
Merge pull request #53 from petergoldstein/feature/fix_deprecation_warnings

Address Rails 4 deprecation warnings
fix migration

remove the pair of brace, since it leads to
`syntax error, unexpected '{', expecting keyword_end t.string :subject{}`
Merge pull request #54 from namiheike/master

fix migration