dompdf: fix handling of images when rendering multiple files in a row

Fix picked from upstream Git (
https://github.com/dompdf/dompdf/commit/2c32bb3fbbdeafcd4628441de260361816aaefc7
) to properly clear the image cache, so
including images doesn't fail when rendering subsequent files with the
same images.

This issue might actually never occur in core CiviCRM itself, as it only
shows when generating multiple PDF files in one PHP invocation. However,
our extension does this, and thus becomes unusable with CiviCRM 4.4 --
so this is indeed a major regression, and the fix urgently needs to go
into the next bugfix release.

(The bug didn't manifest in previous CiviCRM releases, because of the
different setting of DOMPDF_ENABLE_REMOTE.)
Merge pull request #42 from colemanw/master

CRM-13929 - Upgrade timeentry plugin
Merge pull request #43 from colemanw/master

CRM-13935 - Remove mousewheel plugin
Merge pull request #44 from colemanw/master

CRM-13929 - Remove unused fieldselection plugin
CRM-13929 - Upgrade jQuery.form plugin
CRM-13932 - Upgrade jQuery and add jQuery.migrate
CRM-13932 - update jQuery.redirect
CRM-13932 - update blockUI plugin
CRM-13932 - add jquery.tokeninput.min.js
CRM-13932 - add jquery.FormNavigate.min.js
CRM-13932 - add jquery.jeditable.js and rename .mini to .min
CRM-13929 - Upgrade jQuery UI to 1.10.3
CRM-13930 - fix jquery.menu namespace
CRM-13932 - Add uncompressed version of jQuery
CRM-13931 - Upgrade jQuery datatables
Revert "CRM-13929 - Remove unused fieldselection plugin"

This reverts commit 3b27ae18b6e6893d5c8ef7e7ff1bdee9777671ec.
CRM-14035 - Patch smarty to not throw deprecation notice in php 5.5
Merge pull request #40 from sfe-ev/dompdf-fix

dompdf: fix handling of images when rendering multiple files in a row
Merge pull request #45 from colemanw/resources

CRM-13932 - Upgrade jQuery plugins
Merge remote-tracking branch 'upstream/4.4' into 4.4-master-2014-01-08-12-02-20