Merge pull request #196 from eVoLuTiVeMEDIA/master

Smudge 2nd mode = hard ( by pressing [alt] ).
Merge pull request #197 from eVoLuTiVeMEDIA/master

smudge brush: discreet precision improvement
Merge pull request #198 from eVoLuTiVeMEDIA/master

Some improvements for smudge + hints + resources