v150121 (Release Candidate)

• Bug Fix (Pro): Fixed a bug where the Pro Updater would fail when FTP or SFTP details via the WordPress Dashboard are required to perform updates. Props @jaswsinc. See #389.
• Bug Fix: Several fixes for a stubborn bug related to "Fatal Error: 'Unable to clear dir'" error messages and errors referencing "SplFileInfo::getMTime(): stat failed". Props @jaswsinc. See #397.
• Bug Fix (Pro): Fixed a bug where the qcAC variable (used to force-enable/disable GET Request caching) was not respected properly whenever a URL contained a query string and a user was currently logged into the site. Props @jaswsinc. See #401.