I90_load_non_image_file
res/string  de/en
reset Tool if loading failed
I90 also on LoadImage, not only importPng
import png now lets to import from all apps which are able to open
image files, not only automatically the gallery.
cleanup
now with test
fix issue: I91 Eraser paints black after switching
Test modified/added: testSwitchBetweenBrushAndEraser
testSwitchingBetweenBrushAndEraserAndMoveTool added
Merge remote-tracking branch 'origin/master' into
I90_load_non_image_file

Conflicts:
	Paintroid/res/values/string.xml
Merge pull request #103 from Catrobat/I90_load_non_image_file

I90 load non image file

Implementation: @landliebe [ml]
Acceptance: @galstc05 [sg]
Merge pull request #104 from Catrobat/I91_Eraser_paints_black

I91 eraser paints black

Implementation: @schmidiM [MS]
Acceptance: @galstc05 [SG]
merged master and updated help strings