#10 extend node and mm reader/writer by link attribute
 #10 add new fontawesome font with three icons

* add link property to QMCell
* rename CellTest to QMCellTest
#10 QMIcon, _XYZ -> self.XYZ
#10 extend QMIcon by fontawesome link icon
#10 caching the attributed string of the icon
#10 add test for cell size computation with link icon
#10 fixed test and implemented link size computation
#10 fixed test
#10 typo
#10 init fontawesome font in settings
#10 move to hamcrest 3.0.0
update tbcacao
#10 migrate to XCTest
#10 minor code cleanup
#10 complete test

probably forgotten...
update qkit
update tbcacao
update tbcacao
Merge branch 'issue-18' into issue-10
update qkit