Updated database.config files for Unit Tests and Core...

* Also altered the database.config created from install.php to include an ending blank line to comply with PSR-2 recommendations.
Incremental commit. Many changes to rbac.php and Unit Tests...

* Created Unit Tests for new GROUP_CONCAT max limit fix
* Fixed typo in RbacRolesTest::testRolesPermissionsNotOnlyID()
* Renamed newer duplicate getId() method to returnId, changed necessary calls where needed
* Removed redundant code from RbacManager::assign()
* Other minor changes

Still need to work on new unit tests for API changes that have been made recently. Also need to work on converting any existing RIGHT JOINS to LEFT JOINS.
Added Unit Tests for BaseRbac::returnId...

* Related to Issue #4
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
Suggested Fix for Issue #26...

* Changed queries in 'Permissions->roles()' and 'Roles->permissions()' from 'RIGHT JOIN' to 'LEFT JOIN' to fix compatibility issue with SQLite
* All Unit Tests pass
This commit addresses Issue #27. Made additional changes as well...

* I believe I've finished working on all Unit Tests
* I've updated the 'PhpRbac/tests/README.md' file to reflect the changes made
* I've removed all of the v1.0 core Unit Tests (was located in the 'PhpRbac/src/PhpRbac/core/tests/' directory)
* I've removed the 'PhpRbac/src/PhpRbac/core/sql/' directory and made all necessary adjustments. Everything now points to the 'PhpRbac/database/' directory
* I've created the 'PhpRbac/src/PhpRbac/core/README.md' file to briefly explain the existence of the 'PhpRbac/src/PhpRbac/core/' directory
Fixed type in Jf.php. Addresses Issue #28.