APC CSS and JS check.
Added a check for apc and changed apc_exists to apc_fetch so this works on older apc versions than 3.1.4.
Support for new connection class name as per Drupal.org issue #1407282.
Back to 7.x-dev
Issue #1681468 by eddie_c: Add params and return to documentation for field_default_form function
Issue #1703184 by m-abshir: Clarify table parameter in db_rename_table function doc
Issue #1705102 by dsdeiz: Fix reference to nonexestent hook in EntityFieldQuery docs
Issue #1436272 by Albert Volkman, colette, dandaman, coolestdude1: Add information to documentation of drupal_bootstrap function
Issue #1315340 by Albert Volkman, aspilicious: API docs cleanup for entity includes and tests
Issue #1708722 by David_Rothstein: Fixed Call to undefined function drupal_find_base_themes() in drupal-7.15/includes/module.inc on line 184.
Merge tag 'tags/7.15' into pressflow-7.15

7.15 release
Merge branch 'pressflow-7.15'
Issue #1684866 by droplet, nod_, oriol_e9g: Fixed JSHint shortcut.
Issue #1716900 by chx: Clarify why hook_exit() must not print.
Issue #1671200 by chx, sun, jaimealsilva: Fixed Simpletest broken on 5.4: CURLOPT_COOKIEJAR cannot be NULL on php5-curl version 5.4.4.
Issue #1211668 by scito, Devin Carlson, bornholtz: Fixed Special characters are encoded twice for feed icon attribute title.
Issue #1587822 by drumm, bfroehle: Code style: link in field_system_info_alter().
Issue #1685110 by BTMash, aspilicious, jhodgdon: Fixed Upgrade of forum.module d6-d7 loses permission.
Issue #1715402 by mikeryan: Fixed Poor performance of _forum_update_forum_index() when passed a non-forum node.
Issue #1688036 by lucascaro, sun: Fixed Session regenerate and destroy functions do not adhere to drupal_save_session().