Admin bar compatibility for WordPress 3.2 & 3.3

[johnjamesjacoby]

Some final tweaks are needed to ensure compatibility with WordPress 3.3. Reference this ticket in all commit messages.

[boonebgorges]

See also #3813

[johnjamesjacoby]

(In [5481]) Introduce bp_get_major_wp_version() function to work around version_compare() temporal paradox. See #3828 (1.5 branch)

[johnjamesjacoby]

See r5483.

[boonebgorges]

Seeing as we've released BP 1.5.2 for WP 3.3 compatibility, I'm going to mark this as fixed. Further issues can get their own tickets.