DSL: add `tags` stanza

only limited/defined keys are permitted
 - :vendor
 - :font_pitch
 - :font_serif
 - :font_weight
 - :font_slant

forward-compatibility: no associated functionality is
provided.  Intentionally left undocumented.

References: #4688
Updated Unity3D to 4.5.1f3
Merge pull request #5259 from TheZoc/patch-1

Updated Unity3D to 4.5.1f3
adobe flash player update
Merge pull request #5273 from blogabe/flash-14.0.0.145

adobe flash player update
Update Pharo 3.0 SHA
Merge pull request #5274 from justincampbell/pharo-3-sha

Update Pharo 3.0 SHA
Add OsiriX.app 5.9 (32bit Open Source Edition)
Add push cask info for github 2 factor auth
Merge pull request #5276 from alexbarclay/osirix

Add OsiriX.app 5.9 (32bit Open Source Edition)
Merge pull request #5275 from alexbarclay/patch-1

Add push cask doc hint for github 2 factor auth
Upgrade Shadowsocksx to v1.0.9
blender 2.71
makehuman 1.0.1
Merge pull request #5279 from Ihavee/Ihavee

Upgrade Shadowsocksx to v1.0.9
Merge pull request #5280 from cleversoap/master

Blender to 2.71 and MakeHuman to 1.0.1
Rename KeyRemap4MacBook to Karabiner
Suppress HipChat move to applications folder alert
Update Boot2Docker 1.1.1
Merge pull request #5283 from ahbeng/suppress-hipchat-move-prompt

Suppress HipChat move to applications folder alert