Update gwt-maven plugin to 2.2.0 and fix other configuation problems.

Update gwt-maven plugin to 2.2.0 and fix other configuation problems.

These fixes allow me to use 'mvn deploy' to create the war file.

* .classpath: This generated config has been updated by Eclipse. This
change was probably triggered by me updating from Eclipse 3.6.1 to
3.6.2.
* .gitignore: Add entry to ignore the directory
src/main/webapp/WEB-INF/deploy. This directory is generated by Eclipse.
* .project: The generated config has been updated by Eclipse. This
change was probably triggered by me updating from Eclipse 3.6.1 to
3.6.2.
* .settings/com.google.appengine.eclipse.core.prefs: Add empty config
so that Eclipse doesn't complain
* pom.xml: Update to gwt-maven-plugin 2.2.0.
* src/test/java/org/glom/web/client/GwtTestOnlineGlom.java: Move from
'tests' directory to 'client' directory. This is the new
gwt-maven-plugin convension.
* src/test/resources/org/glom/web/OnlineGlomJUnit.gwt.xml: Correctly
refer to org.glom.web.OnlineGlom gwt module and OnlineGlomServiceImpl.