updated gemspec for rails 4 (now allows 'railties' and 'rails' >= 3.0)
added installation instructions to readme
fixed code block indentation in readme
Merge pull request #5 from thinkswan/rails4

Updated gemspec for Rails 4 compatibility; added installation instructions to readme
Bump version
removed personal git pointer from readme
Merge pull request #6 from thinkswan/fix_readme

[fix_readme] removed personal git pointer from readme