Update libraries.

Ruby 1.9.3-p545, Rails 3.2.18, git 1.9.2, postgresql-9.3.4-3, sqlite 3.8.4.3, mysql-5.6.17.
Improve README.md.
Cosmetic changes.
Merge pull request #45 from XhmikosR/master

Update libraries
Merge branch 'master' into 3.0.0