add :quit key to uninstall

The applescript is divided into two commands to keep from transiently
invoking the application in the case where it is not currently running.
quit keyremap4macbook on uninstall

before attempting to unload kext and delete files
validate keys given to :uninstall

this should also be part of audit
add :quit key to uninstall check
document caveats, after_install, after_uninstall

in FAQ.md and CONTRIBUTING.md.  Also divide fields in CONTRIBUTING.md
into two sections: frequently-used and infrequently-used .
Merge pull request #2018 from rolandwalker/uninstall_quit

Uninstall quit
Merge pull request #2019 from rolandwalker/validate_uninstall_keys

validate keys given to :uninstall
cut v0.24.0
Update changelog
refine & document order of uninstall keys

Proposed order - :script, :launchctl, :quit, :kext, :pkgutil, :files.  Quit
a process before attempting to unload an assocated kext, unload kext before
attempting to delete the associated file, etc.  Arguably :script fits
loically with :files near the end of the list.  However, we also have
:after_uninstall which implicitly fires immediately after :files.
Therefore, running :script early provides greater functionality.
add uninstall stanza for pckeyboardhack.rb
Merge pull request #2023 from rolandwalker/doc_more_fields

document caveats, after_install, after_uninstall
Upgrade Vagrant to 1.4.0

http://www.vagrantup.com/downloads.html
http://www.vagrantup.com/blog/vagrant-1-4.html
Merge pull request #2024 from rolandwalker/uninstall_order

refine & document order of uninstall keys
changelog nitpicks

now that @rolandwalker is an official contributor we don't need to call
him out on every change; he gets infinite `<3`s :)
add uninstall stanza to noejectdelay.rb
add uninstall stanza to xquartz.rb
Merge pull request #2028 from rolandwalker/noejectdelay_uninstall

add uninstall stanza to noejectdelay.rb
Merge pull request #2030 from rolandwalker/uninstall_xquartz

add uninstall stanza to xquartz.rb
Merge pull request #2027 from fsargent/patch-2

Upgrade Vagrant to 1.4.0