advagg 7.x-2.28

Bugs Fixed:
#2912888: CSS Minification - Fatal error: Cannot redeclare class CSSmin.
#2846438: When delivering an aggregate an aggregate to the browser the HTTP response code is always 404
#2915257: getmypid() has been disabled for security reasons
#2915914: Don't save data if the content length does not match the data length
#2915669: AdvAgg Modifier performance issue
#2916576: Empty blocks added to HTML page because of AdvAgg block prefix and suffix
#2915134: JSMin+ Doesn't support the use of reserved keywords as object keys
#2917518: fbevents.js changed again
#2918487: Undefined notice in Advagg Relocate.

New Features:
#2862336: Look in themes/THEME_NAME/all/critical-css/urls/page_name for css files to inline
#2913985: If bypass cookie is set allow for debug of user 0
#2913672: Using loadCSS events
#2916668: Overhaul js minification; add in batch, drush, and cron processing
#2918574: Show js compression coverage on admin page
#2919164: Use hook_cron_alter
#2919124: Add (recommended) to as many options as possible to make configuration easier

Notes for other modules:
HTTP Parallel Request & Threading Library is not required but is recommended so Aggregates will be built in the background.