Switch to java7

### fine tuning
Changed `addCompileSourceRoots` of the maven-processor-plugin to false in `org.jboss.as:jboss-as-console-extension`. This fixes the "duplicate class" problem. See https://code.google.com/p/maven-annotation-plugin/issues/detail?id=47. Disabled the flag also in the modules

	org.jboss.as:jboss-as-console-core
	org.jboss.as:jboss-as-console-extension

Background: The maven-processor-plugin is executed twice:
1. As part of the normal lifecycle (phase generate-source) 
2. During the execution of the maven-source-plugin (don't know why)

### cleanup
Removed the maven-processor-plugin from `org.jboss.as:jboss-as-console-parent`. The console and HAL builds run successfully without it. The sources are processed in `org.jboss.as:jboss-as-console-core` and are provided as "source" dependency to the relevant maven modules.

### misc
Changed log level of the gwt-maven-plugin from TRACE to INFO

With this setup both the console and HAL build successfully.