Prepare for Rails 4:
implement gemfiles testing pattern;
improve readme;
add rake task for running tests against all supported AR versions;
add travis.yml;
require library being tested last in test_helper;
removed hipchat from travis
Merge pull request #6 from trumaker/prepare_for_rails4

Prepare for Rails 4:
Bump Rails version to 4.1
Removes mocha and uses Minitest for stubing
Uses latest version of postgres_ext gem from branch rails4.1
Merge branch 'rails4.1' of github.com:mariochavez/postgres_ext-serializers into rails4.1

Conflicts:
	.gitignore