Regarding public release: added Debian8 and Ubuntu14_04 config files to get...

Regarding public release: added Debian8 and Ubuntu14_04 config files to get Qt5WebEngine's snappy and srtp dependencies into 3rdParty and patched. Updated 3rdParty Makefile to patch these libraries' rpaths to origin.

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/trunk@7355 41f8697f-d340-4b68-9986-7bafba869bb8