add some fields to models - flagged, hidden, exemplar, created.
get tree by tag number
a whole load of tree view page stuff - flagging things and emailing people. probably need celery?
some simple tests for tree view
requirements for webtest
pep8 fixes
refactoring map js in prep for offlining
fixing api tree url
rearranging map code
refactoring submit map js in prep for offlining
Merge pull request #13 from adapt/feature/tree-view-page

Beginnings of tree view