GTNPORTAL-2870 In quickstarts generate Java constants for external link
together with READMEs

With workaround for GTNPORTAL-2871.
GTNPORTAL-2873 Revert Portal Extension Quickstart skin from JPP back to
GateIn
GTNPORTAL-2858 Navigation QS readme template fixes
GTNPORTAL-2858 several code fixes and CSS tweaks
Merge branch 'GTNPORTAL-2858_2' of https://github.com/vrockai/gatein-portal-quickstart into GTNPORTAL-2858_2