X11/XQuartz now works right after installation
permit hdiutil to exit with error code

Mysterious `hdiutil` errors are a longtime problem with the
test suite, and the largest cause of false Travis failure
reports.

What appears to happen is that `hdiutil` returns a valid
plist output, but also exits with an error code.

Recently, user errors have been reported which seem to be
related to the same problem (#4857).

After #4892 and #4887, we have have more assurances that mount errors
will be caught elsewhere, if the XML is incorrect/missing, or if the
mounts are not returned.

So, for this special case, it should be safe to simply
ignore the error code from `hdiutil`.
logisim — simplified setting version and moved sha256 line up
All bulletpoints now start with a capital letter in alternate taps doc
changed footnote syntax in alternate taps doc
Mention x11_required caveat in docs
Update TotalSpaces.app to include TotalSpaces 2 for Mavericks
Merge pull request #4906 from vitorgalvao/clearer-logisim

logisim — simplified setting version and moved sha256 line up
added pixi-paint
Further substitutions of 'version' in logisim
Merge pull request #4917 from vitorgalvao/pixi-paint

Added pixi-paint
Merge pull request #4897 from radeksimko/xquartz

X11/XQuartz should work right after installation
Merge pull request #4919 from vitorgalvao/logisim-changes

Further substitutions of 'version' in logisim
Merge pull request #4913 from radeksimko/x11-doc

Mention x11_required caveat in docs
Merge pull request #4900 from rolandwalker/allow_hdiutil_exit_code

permit `hdiutil` to exit with error code
Merge pull request #4911 from vitorgalvao/cosmetic-changes-alternate-taps-doc

Cosmetic changes to ALTERNATE_CASK_TAPS documentation
Merge pull request #4916 from drew-gross/update-total-spaces

Update TotalSpaces.app to include TotalSpaces 2 for Mavericks
made prolificusbserialdriver easier to update
removed pl2303 (duplicate)
Merge pull request #4907 from vitorgalvao/prolific-changes

Prolific changes