Removed CakePHP sources (Issue #19)
Updated .gitignore (Issue #19)
Added CakePHP 2.4.5 via composer.json (Issue #19)

Note that previously CakePHP 2.4.4 was used.  This is a forced
update, since the earliest version of CakePHP in Packagist is
2.4.5.  Here is a link to the Release Notes and changelog, for
convenience:

http://bakery.cakephp.org/articles/markstory/2014/01/26/cakephp_2_4_5_released
Removed DebugKit plugin sources (Issue #19)
Added app/Plugin to .gitignore (Issue #19)
Added DebugKit plugin v2.2.2 via composer.json (Issue #19)
Updated app/ with freshly baked 2.4.5 changes (Issue #20)
Updated README (Issue #19)
Merge pull request #21 from Exwebris/issue-19-composer-migration

Composer migration (Closes #19, Closes #20)