Create arbitrary SObjects from Map

[sebbean]

Enables commands such as:

resp = Forcex.post("/services/data/v20.0/sobjects/Case/", %{ "Subject" => "API TEST 2", "Priority" => "High", "Origin" => "Web"}, client)

Looking to also implement a helper function for creating SObjects using Forcex.Client. Any thoughts or input?

[coveralls]

Coverage remained the same at 0.0% when pulling 82878d2 on sebbean:task/enable-sobject-create-call into cd8b4d2 on jeffweiss:master.

[sebbean]

@jeffweiss curious why you chose to have Forcex module methods use a trailing client param rather than leading (for pipeline operator)

[jeffweiss]

@sebbean the reason that I have client as the trailing param is that for most of the calls, it is the least relevant to the name of the function. True, moving client to the first parameter would make it more cases of using |> possible, but client isn't the focus of many of the functions, nor is it transformed by many of the functions (the obvious exception is Forcex.Client).

[coveralls]

Coverage remained the same at 0.0% when pulling 60618d3 on sebbean:task/enable-sobject-create-call into cd8b4d2 on jeffweiss:master.

[coveralls]

Coverage remained the same at 0.0% when pulling 61a182d on sebbean:task/enable-sobject-create-call into cd8b4d2 on jeffweiss:master.

[jeffweiss]

@sebbean First of all, thank you!
I think we already have something that ought to create an SObject from a map: https://github.com/jeffweiss/forcex/blob/master/lib/mix/tasks/compile.forcex.ex#L80
That said, creating and updating SObject is not my primary use case with this lib, so it hasn't gotten any exercise. We probably do need to set the content type. I will do some investigation.