start moving to django
refactored fragment writers
checkpoint
refactored non-view code
passing some tests
more tests working
more tests
checkpoint
more tests passing
simplify more
some notes
Revert "simplify more"

This reverts commit dc2619e907c5d0187302816476859dcd106b91d9.
auto save after updating start_chunk
simplify tests
add edges back in
re-indexing if missing fragment location index
make annotation and re-indexing atomic
passing genome and IO tests
passing view tests
updated templates and partials