Making the deploy script independent of the Qt installation path

In order to avoid having an hardcoded path to the **qmake** executable in the deploy script, the script now accepts a new string argument identified as: *--qmake_path*. 
To make the deployment successful for any installation path, the [QMAKE_QMAKE](http://doc.qt.digia.com/qt-5.1/qmake/qmake-variable-reference.html#qmake-qmake) variable is used in the *qkide.pro* to find the qmake installation path and to pass it to the deploy script.