Closes issue #3 (readOnly schema op should also work with classes) & issue #8 (cleanup base schema ops: renamings & scaladoc)
Closes issue #7 (Fix package warnings)
Merge pull request #9 from edgarmueller/master

Closes issues #3, #7 & #8

#3: readOnly schema op should work with classes, too
#7: fix package warnings
#8: Cleanup base schema ops