document `conflicts_with`

Only a stub now, but defined into DSL 1.0
Add Intensify Pro.app 1.0.3-610.
gitter 1.159
gravit: fix download filename

It seems they changed the filename.
Merge pull request #6753 from durka/patch-1

gravit: fix download filename
Merge pull request #6751 from andyli/gitter

gitter 1.159
Fix module capitalization
Fix incorrect checksum preventing elm-platform from being installed
Upgrade PuntoSwitcher to 1.4.0
Merge pull request #6755 from ddinh/update-elm-checksum

Fix incorrect checksum preventing elm-platform from being installed
Merge pull request #6746 from alexjarvis/intensify-pro

Add Intensify Pro.app 1.0.3-610.
Merge pull request #6754 from micahbf/patch-1

Fix module capitalization in language reference
Added Tonality Pro.app 1.1.0-800.
Merge pull request #6756 from ndr-qef/alexjarvis-tonality-pro

Added Tonality Pro.app 1.1.0-800.
Upgrade Skitch to v2.7.3
Merge pull request #6758 from mariusbutuc/master

Upgrade Skitch to v2.7.3
Update blender to 2.72a
Merge pull request #6736 from rolandwalker/doc_conflicts_with

document `conflicts_with`
Merge pull request #6759 from ndr-qef/blender

Update blender to 2.72a
Merge pull request #6742 from yurtaev/patch-4

Upgrade PuntoSwitcher to 1.4.0