Incorporating Inome, Inc changes

Hi--

We have made a number of changes that you may be interested in:
* Support Avro schema up to version 1.7.3 (current version as defined http://avro.apache.org/docs/1.7.3/idl.html) - the 
* Include the 'messages' defined in an Avro schema in the generated output
* Parameterize the command-line arguments to allow specifying an output file rather than capturing all from STDOUT in the case that you are running this tool in the context of a maven build where capturing STDOUT is not supported occasionally
* Organize the output of the HTML file such that the root namespace is the first namespace in the column and all other namespaces follow

Let me know if you have any questions. We are currently running our avrodoc version in our build environment successfully.

Thank you,
Micah
Software Engineer :: Inome, Inc.