Bugs with datastore v2

[rgrp]

In progress

1. [major] q does not seem to work reliably. e.g. using the setup from this gist ​https://gist.github.com/1930806 and doing a ?q=DE yields no results (does not work with "q=de" either)
   • q=second does work ...
2. Query on search with limit 0 results in total of 0 (should either be null or correct total). Queries with other limits yield correct total AFAICT
3. Also weird fact that limit is returned but as as as string - should it not be an integer

• Types on fields: could these not be canonical and as per recline (or is it important to allow exact sql types ...)

### Suggestions

Filter support: should think in more detail about this (may want to follow recline style)

Simple filters in query parameters would be nice too ...