fix ob_end_clean error
Merge branch '2.2/feature/Installer_fix' into 2.2/develop
Merge branch '2.2/develop' of https://github.com/pyrocms/pyrocms into 2.2/develop
FIX: added mime types for ppt and pptx files resolved #3298
Fix Files module issue that causes the wrong items to be shown

When a user selects a different folder while the current folder’s contents are in the process of being displayed (one at a time), the items that have not yet been displayed will appear in the newly selected folder. This resolves that issue.
Merge pull request #3299 from phillipdaviesdeveloper/2.2/release/Mime_type_fix_for_pptx_file_uploads

Mime type fix for pptx file uploads
Adding MY_User_agent to 2.2/develop
Merge pull request #3302 from chrisfranson/patch-2

Fix Files module issue that causes the wrong items to be shown
Merge pull request #3328 from bloveless/2.2/develop

Adding MY_User_agent to 2.2/develop
Merge branch '2.2/develop' of https://github.com/james2doyle/pyrocms into 2.2/develop
Add ogv and webm to supported mimes and file types. Closes #3317 and
revert pages admin
Merge pull request #3342 from james2doyle/2.2/new-mimes

2.2/new mimes
Checkbox fix manually applied
Validate files

https://github.com/pyrocms/pyrocms/pull/3011
Validate images too while we're at it.
Fix image field type validation.
Merge pull request #3371 from NicolasSchneider/2.2/develop

Fix image field type validation.
PHP strict bitches about this.
Merge remote-tracking branch 'upstream/2.2/develop' into 2.2/develop