quick check in autogen.sh for git submodules
Use sh instead of bash for autogen
Merge pull request #20 from MapQuest/autogen_bash

Use sh instead of bash for autogen
Merge pull request #15 from MapQuest/autogen_submodule_check

quick check in autogen.sh for git submodules
Use the new simpler is_response_okay in response impl
Merge remote-tracking branch 'origin/500_cacheable' into refactor_command_status
Remove public `status()` method on `tile_protocol`.

Also, make the `protoCmd` enum private to the `tile_protocol`
implementation to ensure that none of the rest of the code can
still be using it.
Improvements to documentation.
Fix bug in composite storage.