start building api operations
fix up some stuff, realize need more structure for operations
make random pointless changes
start getting somewhere
implement most of the topic operations, take a break
implement a large number of operations

- update to latest groundhog
- change StorableJson to be simpler and more easily worked with
- reorganize message query module
- reorganize and improve topic operations module
- start cleaning up imports in Routes.hs
- change out client side error type for better clarity
- implement some client calls to various operations

next steps:
- add timestamp field to MessageHandle
- make operation that constructs messages get the current date and time
- implement function for adding a user to a topic for use in operations
- implement sendInvite function
- add rudimentary subscription system
- fix client to handle no content responses properly
- finish adding operation calls to client
start implementing more ops, reorg monad stack

try to use MonadWriter etc to simplify signatures, run into problem
where more things need instances.

also write a massive mess for sendInvite, which may or may not work
implement topic operations, refactor
Merge pull request #4 from raptros/start-operations

Start operations