Add avro-generated files to git ignore file
Remove previously tracked avro-generated classes
Specify String type for IDs instead of CharSequence in POM
Update model-elements from CharSequence -> String map type
Merge pull request #43 from andrewbts/git-ignore-generated-avro-classes

Git ignore generated avro classes
Merge pull request #45 from andrewbts/avro-string-type-for-map-keys

Avro string type for map keys