JBIDE-13681 compile failed in org.jboss.tools.jst.web.ui

Update parent/pom.xml version to 4.1.0.Alpha2
Merge branch 'master' of github.com:jbosstools/jbosstools-jst
JBIDE-13680 jQuery Widget Wizard should be opened it the center of the screen

Centering is done at increasing dialog size.
JBIDE-13679 HTML5 Palette should be available for any HTML5 file

Test is added.