Merge pull request #3278 from rolandwalker/rename_mame-os-x

rename mame-os-x.rb
rename cloudapp.rb

to cloud.rb
per naming rules in CONTRIBUTING.md
rename less-app.rb

to less.rb
per naming rules in CONTRIBUTING.md
rename postgres-app.rb

to postgres.rb
per naming rules in CONTRIBUTING.md
Merge pull request #3282 from rolandwalker/rename_cloudapp

rename cloudapp.rb
Merge pull request #3283 from rolandwalker/rename_less-app

rename less-app.rb
Merge pull request #3284 from rolandwalker/rename_postgres-app

rename postgres-app.rb
doc: tweaks to CONTRIBUTING.md

- subheads so we can link directly to CONTRIBUTING.md#cask-stanzas
- clarification on naming `pkg` Casks
- fix repetitive language
Skitch 2.7.2
Merge pull request #3011 from rolandwalker/force_container_type

ability to specify container type, not detect
Upgrade Xmarks for Safari to v2.0.13
Merge pull request #3288 from bingfoon/update-xmarks

Upgrade Xmarks for Safari to v2.0.13
doc: drop version numbers from end of Cask names
Add Snippet Edit v1.1
Merge pull request #3287 from ahbeng/skitch-2.7.2

Skitch 2.7.2
Merge pull request #3289 from dcaunt/snippet-edit

Add Snippet Edit v1.1
Vienna RSS 3.0.0_beta20
Yemuzip: new formula.

Yemuzip is a zipper that allows to exclude the osx-specific
metadata (__MACOSX, ._*, etc.)
Merge pull request #3290 from dpo/master

Yemuzip: new formula.
Merge pull request #3291 from cubranic/vienna-30-beta20

Vienna RSS 3.0.0_beta20