Bug fixes and some code formatting

[poppa]

• Commit d87a439 generates a resolve() response for all HTTP OK statues, not only 200. Before this fix a HTTP 202 would end up in reject(), which is wrong.
• Commit 25a97a8 is a fix for Issue with in-path parameters #10
• Commit 06234e8 adds a ? after a property in an interface if the property is optional:

  interface MyInterface {
    myRequiredProp: string;
    myOptionalProp?: number;
  }

• Commit 0cb70b4 does the same as above but for method arguments:

  export class MyClient {
    public static myMethod(requiredArg: number, optionalArg?: string) {}
  }

• Commit 1141952 is a fix for Add the property inQuery to parameters #11
• Commit 25a97a8 should probably have a closer look. My guess is that the "1" is intended to make sure the Mustache template is only iterated once? My guess is that that only worked correctly if the very first parameter was inBody, which isn't always the case. This fix could possibly make it possible for multiple .send() calls to be generated. It hasn't happened for me yet though.

Other than that it's mostly cosmetical changes since I find the code style hard to read.