Populated HeaderCollectionTest. Added the getAt method to HeaderCollection.
Added the getCountByName method to HeaderCollection.
Added Content-Type as a default request header, differentiating between string and byte array. Also tests.
Added Content-Type as a default response header, differentiating between string and byte array. Also tests. However, there currently is no way to tuern default response headers off.
Added sleep time to the shut down test.
Made it interpret more content types as text to convert to String.
Merge pull request #16 from izrik/auto-content-type

Auto content type