Add methods to the API that implement sendFax using an array of
InputStreams rather than an array of files.

These are unit tests to test the added sendFax methods that send a fax
using input streams

# Conflicts:
#	src/main/java/net/interfax/rest/client/InterFAX.java
#	src/main/java/net/interfax/rest/client/impl/DefaultInterFAXClient.java

Document upload and send uploaded document were getting a code
411 because the content length was not being sent. This is because
Java began filtering content length because it is considered dangerous
to be settable.

This fix repairs that problem by sending actal zero byte content
which circumvents the issue.

The current code code of the uploadChunk method allowed
200 and 202 as valid response codes. However, the server
also sends 204s and the method incorrectly identified
this as an error. This commit corrects that.

Allow 204s