Fixes the #150 issue

The new configuration constant ```__QCUBED_JS_CORE__``` is introduced.
It can be set to the qcubed.js in a development mode or to the _qc_packed.js in a production mode.
Merge pull request #151 from olegabr/bug-150

Fixes the #150 issue
Merge branch 'bug-150' of https://github.com/qcubed/framework