Add 'Known Problems' section

This fix adds reference to ubuntu related problem with vncserver when it skips
's' chars in input. This leads to test failures, because of test projects
with 's' char in name could not be located in Projects. For example if test
creates projetc with name 'CordovaTestProject' the actula project created in
workspace has name 'CordovaTetProject' and test fails.
Change parent pom to 4.2.0.Final-SNAPSHOT
Update version to 4.3.0-SNAPSHOT and point to new parent

Now that JBT 4.2.0.Final is released, we need to move to
the new version.
AS: fixed issue with browser title for EAP 6 and caching of welcome page