Add Cask for LastPass Universal Mac OS X

This patch adds support for the LastPass Universal
Installer for Mac, which is a .dmg containing
all of the LastPass browser extensions.
Upgrade little-snitch to 3.1.1
Merge pull request #1014 from bolasblack/master

add ccleaner cask
fixes #1015: requires library with checksum method

homebrew did some library reorganization which broke brew-cask
this should fix it
require software_spec in download.rb

another lib looking for formula_support
contributing.md: symlink to taps instead of home

The rest of the contribution instructions
have people working on the clone already in brew taps.

This just updates a reference that is still pointing
to the would-be contributors' home directory.
travis.yml: build against current homebrew
Merge pull request #1017 from billwanjohi/require_checksum_directly

fixes #1015: requires library with checksum method
Merge pull request #1018 from billwanjohi/contributing_tweak

contributing.md: symlink to taps instead of home
bump version to 0.16.1

also pull version into a variable because i'm sick of typing it twice
every time
Merge pull request #1010 from gregstallings/little-snitch

Upgrade little-snitch to 3.1.1
sigh stupid typo
bumping version to v0.16.2

to release past the typo
Add GrandTotal 3 cask
Update Quicksilver to version 1.1
Merge pull request #1023 from NanoXD/master

Update Quicksilver to version 1.1
Merge pull request #1022 from NanoXD/GrandTotal3

Add GrandTotal 3 cask
Update MakeMKV to 1.8.5
Merge pull request #1024 from NanoXD/master

Update MakeMKV to 1.8.5
Update BackInTime to 3.0.0