Plenty of small improvements/fixes#1

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ArnaudBienner wants to merge 12 commits intowesj:masterfrom

ArnaudBienner:master

Commits on May 6, 2014

Start playing with this, and fix a few things related to init:
ArnaudBienner
committed

Commits on May 31, 2014

Make setColor public and add a getColor method
ArnaudBienner
committed

Commits on Jun 1, 2014

Reactivate hardware acceleration in the project settings, and remove the setLayerType calls, which don't look necessary anymore
ArnaudBienner
committed

Commits on Jun 12, 2014

Update mHSV when updating color and vice et versa
ArnaudBienner
committed

Commits on Jun 22, 2014