Switch over to connectors and endpoints completely.
Better SMS content sending.
We need more changes before we can accept gzipped API responses.
Fix test.
Easier hook for overriding sending an sms.
Add some example configs.
Use vumi logging.
Added extensive wiki-related logging
Reformat some things.
Fix handling of inbound SMS during inappropriate session state.
Some commented-out hacks that are useful for debugging failing tests.
Content lengths logging, select option returns index

* Added content length logging
* Added a stub for content normalization
* select_option() now returns selection and its index
Merge branch 'feature/issue-20-connectors-and-endpoints' into develop