Update Eclipse and Maven configs to in preparation for the postgres JDBC jar.

 Update Eclipse and Maven configs to in preparation for the postgres JDBC jar.

 * .classpath: Change JRE to Java 1.6, remove GWT configuration as we're now
 using Maven.
 * .settings/com.google.gwt.eclipse.core.prefs: Don't copy gwt-servlet.jar to
 the compiled webapp directory that Eclipse uses as we're using Maven now.
 * .settings/org.eclipse.jdt.core.prefs: Change target platform to Java 1.6.
 * .settings/org.eclipse.wst.common.project.facet.core.xml: Change Java version
 to 1.6.
 * pom.xml: Format file, change target Java version to 1.6.