JBIDE-15489 Broken content assist for complex ELs

Issue is fixed. JUnit Test test is added for the issue (in javaee/tests because requires JSF EL proposals to
be produced.
JBIDE-15605 Validation problem in faces-config.xml for JSF 2.2 projects

I failed to add javaee_7.xsd to catalog. But since WTP adds
web-facesconfig_2_2.xsd, let's just remove our file from the catalog.