Travis CI: updates to travis config & setup

* updated config & added database.yml.travis

* updated travis.yml before_script

* removed sockets from mysql database.yml

* updated before_script to create the mysql skiima user, so it doesnt error out

* added ruby 2.0.0

Readme: added travis badge
Postgresql Spec: fixes failing postgres spec for version.

* added attr_accessor to postgresql helper
* override initialize for PostgresqlConnector to check version