Forms and Drugs endpoints

[crobject]

This pull request adds functionality for both the forms and the drugs endpoints. It allows for both searching and getting.

[twyfordr]

Does this PR contain anything that #3 doesn't already have? I accidentally skipped this one in review. Also, it appears to be behind master.

[crobject]

@twyfordr Yes, #3 was based on this PR, so #3 it builds on this one.

[brandonjoyce]

I think a private helper method could dry some of these up a bit.

private bool HasParameter(ParametersType params, string name, string value) {
  return params.Any(p=> p.Name == name && p.Value.ToString() == value;
}

Then your tests can be a little more concise:

var authValue = string.Format("Bearer {0}+x-no-pass", _apiId)
Assert.That(HasParameter(_searchFormSimple.Parameters, "Authorization", authValue));
Assert.That(HasParameter(_searchFormComplex.Parameters, "Authorization", authValue));