Reorganizes version properties in parent POM
Adds support for Wildfly application server via the wildfly maven plugin. To run
the Wildfly server run:

$ mvn wildfly:run

In order to run wildfly:(re)deploy a management user must be added via:

$ {path-toequity-webapp}/target/wildfly-run/wildfly-8.1.0.Final/bin/add-user.sh

Also adds jboss-all.xml configuration to work around an issue with deploying to
the Wildfly 8.x server with Guava as a dependency.
Adds interface io.vos.equity.model.Model and implements from class Equity.
Adds jersey MessageBodyWriter implementation JsonMessageBodyWriter for writing
JSON responses in a common format.

See:

https://jersey.java.net/apidocs/1.18/jersey/javax/ws/rs/ext/MessageBodyWriter.html
http://eclipsesource.com/blogs/2012/11/02/integrating-gson-into-a-jax-rs-based-application/
http://stackoverflow.com/questions/11216321/guice-jersey-custom-serialization-of-entities
Removes date field from Equity model.
* Adds class ApiResponseWrapper for defining a standard API response format.
* Updates JsonMessageBodyWriter to use the ApiResponseWrapper when writing api responses.
* Binds the Gson instance using a new ApiSerializer binding annotation.