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
Merge pull request #3299 from phillipdaviesdeveloper/2.2/release/Mime_type_fix_for_pptx_file_uploads

Mime type fix for pptx file uploads