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.
Merge pull request #1007 from leonardvandriel/master

Charles 3.8.1
add parallels-8 cask

this is commercial software, and not even the latest version
so I'd understand if this doesn't fit the brew-cask model
remove checksum

since this is a non-specific version url
Merge pull request #1008 from billwanjohi/add-parallels-8

add parallels-8 cask
Brightness 1.1.2
Merge pull request #1009 from tlehman/brightness-1.1.2

Brightness 1.1.2
Upgrade little-snitch to 3.1.1
geekbench: rename (Geekbench, not Geek Bench); bump to 3.0.2
Merge pull request #1012 from darinmorrison/master

geekbench: rename (Geekbench, not Geek Bench); bump to 3.0.2
add ccleaner cask
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