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Merge branch 'master' of https://github.com/pencil2d/pencil
instant eraser feature completion

temporary eraser minimum radius=2 units, maximum=100 (eqv. size 4 to
200)
(for lower sizes use the eraser tool)
Merge pull request #96 from eVoLuTiVeMEDIA/master

Instant eraser completion and code refact
clear closestCurves and closestVertices on clear image
add a sanity check when drawing curves for move
recognize jpeg alongside jpg
Merge pull request #98 from wesen/bug/crash-on-vector-move

Fix crash when moving a cleared vector layer
Merge pull request #99 from wesen/bug/recognize-jpeg

recognize jpeg alongside jpg
Merge branch 'master' of https://github.com/pencil2d/pencil
Disable C++11, update version number
Merge pull request #100 from chchwy/master

0.5.4
resolve conflict