Fix the jsonrpc adapter to reference the method correctly

See https://github.com/strongloop/strong-remoting/issues/124
Update jsonrpc-adapter.js

Wrapped function method "toString" overwritten before been registered in jayson server, this allows mapped parameters (jsonrpc-adapter.js)
Made test of mapped parameters on JSON RPC
Fixed a typo
Fixed a typo
Fixed a typo
Merge pull request #1 from drFabio/feature/fix-issue-124-mapped-parameters

Feature/fix issue 124 mapped parameters
Update jsonrpc-adapter.js

I had to this because jayson uses fn.toString to map the parameters, and since you wrap the method, the jsonrpc server cannot read them.

I solved this overwriting the toString method on the wrapped function, creating this fake string that has the paramenters names in it.
Merge pull request #128 from ericprieto/feature/fix-issue-124-mapped-parameters

Feature/fix issue 124 mapped parameters