WL-3444 : Add 'feedback tool' to every site & dont allow it
to be hidden or removed

Portal part (there is also a kernel part):
--Add properties for Contact Us tool text etc.
--Add Contact Us tool to every page
WL-3444 : New db method not needed as there's already a suitable one that can be used
WL-3444 : Add config, create private method

Change constants representing URL patrs to use config
Move getFeedbackURL(siteId) to private method in portal
WL-3444 : Make method private / remove javadoc
Merge pull request #22 from ox-it/WL-3444

WL-3444