Group feature test more explicit, improve README
Rename collect parameter to collect_fields

To be more explicit about what it actually is.
Only propagate specified fields when grouping

Previously, any leftover fields were passed to the result record
which was misleading.

Now we don't include unspecified fields in the result.
Remove redundant collect parameter from tests
Add ability to specify different collection methods

Methods are passed in to a collect query param as field:method.
Remove deprecated collect response from new call

If you request field:set, you should only receive field:set
in the response, not field as well.
Improved error when request nonsensical collect

When you request a collect sum on a string (or similar),
you should receive a 400 bad request.
Switch off flakey test

It is causing CI to fail every time. It seems to be an issue in
selenium.
https://code.google.com/p/selenium/issues/detail?id=3812
Ignore wip scenarios in travis and jenkins

All the ways of running tests should act the same way. I would like to
have this done in just one place but I don't want to hold up this pull
request any more.
Merge pull request #113 from alphagov/read-api-collect-maths

Add ability to specify different collection methods