Print tracebacks when errors happen.
Various minor cosmetic changes.
Refactor exceptions to utilize the werkzeug inheritance tree.  Exceptions are now full-fledged response objects.
Fix issues with exception printing and hide it behind a debug flag.
Update example server with debug flags.
Merge pull request #36 from armet/rewrite-26

NO_CONTENT if there isn't any
Merge branch 'rewrite' of github.com:armet/python-armet into rewrite

Conflicts:
	armet/api.py
	armet/http/exceptions.py
	tests/test_api.py
Remove state checking and fix issue where an api was only created once per class
Fix stuff lost during merging.
Remove blank line.
Merge remote-tracking branch 'origin/rewrite' into rewrite

Conflicts:
	armet/api.py
Generalizing registry, WIP