Support indexed getters (gettters with single argument)

[npryce]

I'd like to easily fake an indexed getter. E.g. the method HttpServletRequest::getHeader(String) -> String.

I was thinking it could be done with a map in the faker delegate. Something like:

new Faker<HttpServletRequest>() {
    Map<String,String> header = ImmutableMap.of("Host", "www.example.com", ... );
}.get();

[dmcg]

Is the special case much more convenient than just providing an implementation?

Map<String, String> headers = ImmutableMap.of("Host", "www.example.com", ... );
new Faker<HttpServletRequest>() {
    String getHeader(String header) { return headers.get(header); }
}.get();

[npryce]

Once is no problem. After repeating the same pattern of code for indexed properties of different types in several tests, I thought it would be worth supporting directly in the library.

Also, if the type had indexed getters and setters, Fakir could store key/value pairs passed to the setter into the backing map.

[npryce]

Implementation in pull request #3