GUI Calculator example with Qt libraries
Added CUKE_CALCQT_WAIT env variable to set CalcQt example wait time for each step.
Skip compilation when FindQt4 fails.
Cleaned indentation and curly brackets. Removed commented code and useless includes.
renamed delay env variable to CALCQT_STEP_DELAY
Merge pull request #58 from gambr/calcqt_example

GUI Calculator example with Qt libraries