Audit the Augur RPC tests

[bobsummerwill]

Are they more complete than these tests?

What is our best path forward to complete an RPC test suite which covers the whole API surface?

From https://gitter.im/ethcore/parity?at=57d3a416d274dbdf3505ba39, @tinybike says ...

@bobsummerwill sorry just saw your question about tests! Yes, augur's RPC tests are indeed available -- they're the augur.js tests

https://github.com/AugurProject/augur.js

(we also have some generic RPC tests in https://github.com/AugurProject/ethrpc, but most of them are in augur.js)

actually this is a bit awkward because I just overhauled some of our trading functions in augur.js, and so I'm embarrassed to say augur.js has some broken tests on master

this should be fixed over the next few days tho!

CC @winsvega, @karalabe, @chfast.