Finished creating Unit Tests for v2.0-stable...

* Finished adding/altering the Unit Tests that are affected by newest API changes
* Ran tests on both Windows 8.1 and CENTOS 6.5 x86_64
* The only tests that fail are due to the problem addressed in Issue #26
* Needed to change all instances of 'is_int' to 'is_numeric'
* Updated 'PhpRbac/tests/database/database.config' so it is easier to switch between MySQL and SQLite configs

Addresses Issue #27