Moved docs/images to docs/_static/images
Moved 'for django developers' to new 'Pages' section
Moved a few documents into pages section
Restructuring pages section
Moved 'for frontend developers' into Pages section
Removed contents from pages index
Moved editing_api into pages docs
Added components sections
Added howto section
Added reference section
Moved roadmap into releases section
Moved some docs into contrib components
Removed 'Overview' title from Pages index (was messing up toctree)
Moved 'settings.rst' into howto
Removed Advanced topics
Merge pull request #511 from kaedroho/docs_restructure

Docs restructure
Merge remote-tracking branch 'torchbox/master' into image-smartcropping