Initial commit for issue #20
Database access for all page and contnent opperations are now in the model; no sectioning
Hopefully, image/png support.
Issue closed: Merge branch 'iss20' of https://github.com/shikasta-net/LabBook

Conflicts:
	controllers/render.py
Resolve conflicted file controllers/render.py
Changes to reimplement image boxes on master branch
Tidying up after failed merge with master
Merge branch 'master' into iss6_pdfjs

Conflicts:
	controllers/default.py
	controllers/render.py
	views/default/index.html
	views/render/box_content.html
Revert box_content
Adding pretty rendering of non-supported mimetypes
Merge branch 'master' into iss6_pdfjs

Conflicts:
	controllers/render.py
	views/render/box_content.html
PDF page selection support.

This commit also includes much tidying of imgbox support. imgboxes can now be wrapped and unwrapped (made a child box/not a child box) etc. Testing on science graph PDFs would be good.