updated gitignore, deleted builds
	modified:   .gitignore
	deleted:    Aufgabe1/build-RationalCollection-Desktop_Qt_5_1_1_MinGW_32bit-Debug/Makefile
	deleted:    Aufgabe1/build-RationalCollection-Desktop_Qt_5_1_1_MinGW_32bit-Debug/Makefile.Debug
	deleted:    Aufgabe1/build-RationalCollection-Desktop_Qt_5_1_1_MinGW_32bit-Debug/Makefile.Release