demote FAQ.md to doc directory

This doc currently has very little content.  Also fix link
text for other content in the doc directory.
Create rpp.rb
doc: prepend vendor names to disambiguate

note as well that Casks which differ only by placement
of hyphens are somewhat ambiguous and to be avoided.
rename Casks which collide on "flux" by vendor

The product from justgetflux.com becomes flux.rb.  The
current flux.rb is renamed the-escapers-flux.rb.  This
resolves having two Cask names which differ only by the
placement of hyphens.
rename Casks which collide on "unison" by vendor

`unison-usenet.rb` becomes `panic-unison.rb`
rename Casks which collide on "webpquicklook"

disambiguate by vendor/developer
Updating filename and Classname to naming rules
rename second-life.rb

to second-life-viewer.rb
per naming rules in CONTRIBUTING.md
gpgtools: reset owner on ~/.gnupg

fixes #3360
Merge pull request #3366 from rolandwalker/gpgtools_permissions

gpgtools: reset owner on ~/.gnupg
much more complete uninstaller for `gpgtools.rb`

Based on uninstaller script from the GPGTools distribution.
Also includes caveats re: files installed in `/usr/local`
Merge pull request #3365 from rolandwalker/rename_second-life

rename second-life.rb
Added Xee

Xee is a lightweight, fast and convenient image viewer and browser. It
is designed to be a serious tool for image viewing and management, with
a sleek and powerful interface.

Xee is useful as a more powerful replacement for Preview, or most any
other image viewer available on Mac OS X. It is very fast, and uses
less memory than most other image viewing tools. It also uses OpenGL to
display and scroll images much more smoothly than other viewers. Its
interface is highly streamlined and has easily configurable keyboard
shortcuts.
Updated Pagico
Add uninstall stanza for NMap
Add uninstall stanza to EAGLE
Add Leap Motion software
Update colorpicker-developer.rb

URLs changed
Merge pull request #3373 from ahbeng/leap-motion-latest

Add Leap Motion software
Merge pull request #3363 from alebcay/xee

Added Xee