Revisions: Fix PHP loading of comparison to first revision, and premature rendering of tooltip.

Props aaroncampbell, markjaquith. Fixes #24873 for trunk.

git-svn-id: http://core.svn.wordpress.org/trunk@24864 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix pass by reference issue. see #24873.



git-svn-id: http://core.svn.wordpress.org/trunk@24866 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Unique load array in load-scripts and load-styles.



git-svn-id: http://core.svn.wordpress.org/trunk@24868 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Limit pingback response size. fixes #4137. for trunk.



git-svn-id: http://core.svn.wordpress.org/trunk@24871 1a063a9b-81f0-0310-95a4-ce76da25c4cd