Add modification type to ReviewFile

Change-Id: I7d9cf5e28eb77b3c3413851157db983a891a0ec0
Gerrit won't add deleted files to review, closes #1

Change-Id: I3d67e8a2433222d66f87de7a55d2f4d4cf63d047
Merge branch 'master' into GITHUB-19-dont-repeat-comments

Conflicts:
	src/main/java/pl/touk/sputnik/connector/stash/StashFacade.java