suggest replacements on "brew cask install" fail
list form of `system` for jxplorer `after_install`
display artifact summary in `brew cask info`

Per discussion with @drew-gross in closed issue #3280.
Limitation: does not show link targets.
update keepassx to 2.0 series

In spite of the alpha version scheme, this is the most usable version
available, support for the previous release series was EOL'ed a long
while back and they are completely unmaintained (last patch release over
4 years ago). The 2.0 series was started 4 years ago and has been
releasing builds labeled alpha since May 2012. Anybody actually using
this software is using these builds in spite of the version labeling
scheme.
Update to latest build number in virtualbox 4.3.10
Merge pull request #3684 from scottsuch/fix_virtualbox_4.3.10_release

Update to latest build number in virtualbox 4.3.10
Update Bitcoin to 0.9.0
Merge pull request #3686 from drew-gross/bitcoin

Update Bitcoin to 0.9.0
Upgrade Google Music to v1.1.1
Merge pull request #3687 from kevinoconnor7/upgrade-google-music-1.1.1

Upgrade Google Music to v1.1.1
Add Sococo.app v3.2.7
Merge pull request #3688 from dustinobrien/sococo

Add Sococo.app v3.2.7
Update CloudyTabs.app to v1.2
Merge pull request #3689 from josh-/cloudytabs

Update CloudyTabs.app to v1.2
Update CotEditor to 1.4.1
Added Arranger.app v1.5

An app for arranging windows on the desktop with the keyboard.
Merge pull request #3694 from troter/update-coteditor-to-1.4.1

Update CotEditor to 1.4.1
Merge pull request #3681 from alerque/patch-2

update keepassx to 2.0 series
add `caveats` stanza for KeepPassX

per @sigito in #3681
Merge pull request #2706 from rolandwalker/install_suggest

suggest replacements on "brew cask install" fail