Diff users should be taken back to the version they came from
Add from_version to TOC and next, previous links
PEP8
add tests for from_version
PEP8
Merge pull request #437 from khandelwal/diffs_back

Diff users should be taken back to the version they came from
Merge branch 'master' of https://github.com/eregs/regulations-site into buildout