Adds POM dependencies for java.annotation.Nullable and java.annotation.security.*
Updates JsonMessageBodyWriter to handle all result classes instead of throwing.
Adds interface ApiResource an implementation in EquityResource
* Adds security package io.vos.equity.webapp.api.security
* Uses Guice provided AOP to wrap any method annotated with
  javax.annotations.security.RolesAllowed to ensure the annotated role is
  present in the current session before allowing the method to be executed.
* Loads security module in GuiceServletConfig
Adds SessionFilter to ApiModule and wraps all calls to /* in the
SessionFilter. Doesn't really do anything other than log a message yet though.