update Trailer to version 1.0.17

closes #2816
Merge pull request #3411 from rolandwalker/update_trailer

update Trailer to version 1.0.17
Added Spark

Spark is a powerful, and easy Shortcuts manager. With Spark you can
create Hot Keys to launch applications and documents, execute
AppleScript, control iTunes, and more...
Merge pull request #3402 from alebcay/spark

Added Spark
Bump Codekit version to 2.0
Merge pull request #3417 from kevinSuttle/codekit2

Bump Codekit version to 2.0
Add QtSpim.app v9.1
Merge pull request #3418 from bfontaine/qtspim

Add QtSpim.app v9.1
New Cask: Adobe AIR Redistribution Helper

The Adobe AIR Redistribution Helper (ARH) utility is a small
executable that you can use as part of a custom installer. It can
perform many tasks such as detect the presence and version of an
installed AIR runtime as well as silently install AIR applications.
New Cask: Pandora One Desktop App 2.0.8

With the Pandora Desktop Application, you can play your Pandora
stations right from your desktop – without opening a new browser
window. Plus, because the desktop app is only available as part of
Pandora One, your music is completely free of all advertising.
Merge pull request #3419 from vmrob/pandora-one

New Cask: Pandora One Desktop App 2.0.8
Merge pull request #3420 from vmrob/arh

New Cask: Adobe AIR Redistribution Helper