Don't prefer Cask files in the cwd

Fixes #4641.  Cask files in the cwd are still permitted, but
at the very lowest priority, below Tapped Cask names.
show resolved Cask source file or URI w/ --debug

references #4641
doc: improve Cask-source-resolution debug message
Fix incorrect permissions on brew-cask.rb
Merge pull request #4659 from alebcay/master

Fix incorrect permissions on brew-cask.rb
document the caskroom/unofficial Tap
doc: we now have user-maintained alt Cask Taps
Updated genymotion to 2.2.2
Merge pull request #4662 from ignasi/master

Updated genymotion to 2.2.2
added SDFormatter 4.0
Merge pull request #4663 from JALsnipe/sdformatter

Added SDFormatter 4.0
Added cask for Garmin ANT Agent
Merge pull request #4664 from felixkosmalla/ant-agent-cask

Added cask for Garmin ANT Agent
Adding a cask for Logitech MyHarmony

added /n
Merge pull request #4658 from rolandwalker/demote_implicit_path_source

Demote implicit Cask path sources (i.e. files in current working directory)
Merge pull request #4661 from rolandwalker/doc_alt_taps

Document alternative Taps
Opera 22.0.1471.50
Merge pull request #4666 from ahbeng/opera-22.0.1471.50

Opera 22.0.1471.50
Merge pull request #4634 from jloveland/logitech-myharmony-app

Adding a cask for Logitech MyHarmony
AeroFS updated to 0.8.41