Enable make_request to have file arguments
Update audit system to allow deleting

Previous initialization order allowed us to fake deleting by calling
`super(UserTrackable, self).delete(...)`. This worked because
`models.Model` was last in the declared super class chain.

Now we assume there is a undeclared dependency in that subclasses of
`UserTrackable` must also be subclasses of `models.Model`.

The obvious solution is to make `UserTrackable` itself a subclass of
`models.Model` however you end up a non-tree like inheritance hierarchy.
Add in utility for specifying a single http verb
Use byte strings so that django doesn't freak out

For some reason these tests just broke (which freaked me out). Debugging
didn't lead to the change the broke it but did lead to a root cause. In
particular, it appears that django was trying to de-serialize a request
body a byte stream.

Since we're trying to python 3 ready we've been using unicode
strings. Changing these to byte strings seems to fix the problem.
Add in photo handling for both local and S3
Tree photos should change a tree's hash
Move css files out of static directory and compile sass files to css
Concatenate vendor css
Add photo handling to plot detail page

Show tree photo and allow upload
Merge pull request #282 from ahinz/topic/s3-photo-integration

Add in photos
Minify CSS files and use minifed version when not in Django DEBUG mode

We're using node-sass, which unlike normal sass does not yet have
built-in compression.  When that is added, we should switch to have sass
compress main.css
Merge pull request #286 from maurizi/topic/compileSass

Compile sass
Guard against null tree_ids

Since None is a 'valid' tree id for this view function, we need to
handle it first
Add in example images for testing