Removes jetty-maven-plugin dependency.
* adds POM profiles dev and wildfly, both active by default.
* dev does nothing currently, is a container for future property values.
* wildfly loads the JEE 7 APIs and implementations needed for the apps and
  provided by the Jboss JavaEE 7 implementation BOM with hibernate
* Adds mysql jdbc connector jar to global dependencies
* Adds guice jpa jar to global dependencies
* Moves guice core jar from dependencyManagement to global dependencies
* Adds a persistence.xml file to equity-model, defining a data store for models
* Adds EquityController for persisting Equity models via the jpa EntityManager
* binds the jpa EntityManager via guice in the webapp ApiModule
* uses the EquityController from EquityResource to store Entity values to a
  database

For instance try:

$ curl -XPOST -vvv http://localhost:8080/equity-webapp/api/equity

$ curl -vvv http://localhost:8080/equity-webapp/api/equity/1