Fixed link parameter in cask for MacVim

The latest version of MacVim places app within MacVim-snapshot-70 folder so link
path has to include that folder.
Merge pull request #1174 from lucmendelowski/fix_macvim_link_path

Fixed link path in cask for MacVim
Merge pull request #1173 from jTux/master

upgrade droplr to 3.5.0
Authy 1.2

Authy changed it's url location
Google Quick Search Box 2.0.0.1447

Fix 404
AquaTerm 1.1.1
Anki 2.0.13
ClamXav 2.6.1
Remove Enjoy.app

- Homepage and download are down
iReadFast 2.0

- URL has changed
Fix link for Papers 2
Pester 1.1b17
Remove Pixen

Pixen is now MAS only
Cask for ShadowSweeper

ShadowSweeper disables drop shadows on windows, useful with tiling
managers such as Slate or SizeUp. Insanity's ShadowKiller is more
widely used, but now deprecated and not available from their page
anymore.
Merge pull request #1176 from maebert/master

Cask for ShadowSweeper
Add twitterrific 4.5

Add twitterrific app - beautiful twitter client.
Merge pull request #1177 from lucmendelowski/twitterrific

Add twitterrific 4.5
Add Choosy
Merge pull request #1179 from jimbojsb/choosy

Add Choosy
Update Amethyst to 0.8.2.