Fixes #6259: URLs no longer get unnecessary offset=0
Added URL fragment (#anchors) support to elgg_http_build_url
Added tests for elgg_http_add_url_query_elements
Refs #6248 - HHVM compatibility - The required parameter $vars = array() is placed after an optional one.
Refs #6248 - HHVM compatibility - Corrected extender_url_handler behavior
Refs #6248 - HHVM compatibility - The variable $site_guid is not declared.
Refs #6248 - HHVM compatibility - The call _elgg_session_boot(NULL, NULL, NULL) has too many arguments.
Refs #6248 - HHVM compatibility - The call elgg_dump($msg, false, 'WARNING') has too many arguments.
Refs #6248 - HHVM compatibility - The constant mts is not declared.
Refs #6248 - HHVM compatibility - Undeclared variables
Refs #6248 - HHVM compatibility - elgg_view_deprecated requires all parameters
Merge pull request #6282 from Srokap/hhvm

Refs #6248 - HHVM compatibility
Alphabetize friends/friends-of, group notifications, group owned/member lists
Merge pull request #6284 from beck24/alphabetize-core-lists

Alphabetize friends/friends-of, group notifications, group owned/member lists
Merge pull request #6270 from Srokap/pr/6264

Fixes #6259: URLs no longer get unnecessary offset=0
Fixes #6285 - Drops obsolete rss/object/groupforumtopic view from groups plugin
Merge pull request #6286 from Srokap/ticket_6285

Fixes #6285 - Drops obsolete rss/object/groupforumtopic view from groups plugin
Sample composer config. Don't merge this one into master branch of Elgg/Elgg!