Fix license block
Move WP_Stream_Connector into includes; remove WP_STREAM_CLASS_DIR
Rename db-actions.php to db.php for consistency with WP_Stream_DB class name
Rename filters.php to filter-input.php for consistency with WP_Stream_Filter_Input
Add object-caching to connectors glob, action for clearing cache upon upgrade
Only do PHP version check once; load up translations for PHP version error
Merge branch 'develop' into weston-review

Conflicts:
	stream.php
Merge branch 'develop' into weston-review
Merge pull request #344 from x-team/weston-review

Ongoing review from Weston