Merge remote-tracking branch 'origin/master'

Conflicts:
	.gitignore
	src/hu/bme/tmit/hsn/stretch/Main.java
	src/hu/bme/tmit/hsn/stretch/interfaces/Stretch.java
Revert "Merge remote-tracking branch 'origin/master'"

This reverts commit 5872a58f71d8342131af2398b35ecb4f3915a13d.
cleaning code