Add support for JacksonAnnotationsInside.

Added one test to make sure it works:
new class CredentialsWithJacksonAnnotationsInside
new test annotation @TestJacksonAnnotationInside
Added test at
EncoderDecoderTestGwt.testJacksonAnnotationInsideProperty()
Merge pull request #205 from seamusmac/master

Add support for JacksonAnnotationsInside.