More changes:
- remove Client interface (reason: empty)
- introduce HTTPClient interface, which can be used for both ClientURI
and ClientJSONRPC clients (so our users don't have to create their own) (Refs #8)
- rename integration tests script to `integration_test.sh`
- do not update deps on `get_deps`
Use 0x-prefixed hex strings in client
server: Decode hex string args
Encode all string args as 0x<hex> without trying to encode as JSON
Added tests for special string arguments
Fix server handling quoted string args
Added string arg handling test cases to bash test script
Anton Kaliaev
Matt Bell
Ethan Buchman