Initial attempt at landing page with useLocalMathJax check
Basic PDF viewing support, using PDFJS
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
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.
Extending pdf.js support to PDF printing. Rendered image style still not right.
Fix adding correct style to converted PDF IMGs
Add an install check to see if scheduler is running