Update README.md
Update README.md
Update README.md
Merge pull request #48 from jameseriot/master

Several changes related to the upcoming version 3.1.0
fixed codename in changelog
updated changelog for version 3.1.0
set minimum qt version to 4.7
updated language selection: load only at startup
removed unecessary qdebug, removed qt 5 method call
updated release script
added option for building a minimal version of RealOpInsight Workstation without ngrt4nd and QtWebkit supports
fixed compilaition on RedHat and openSUSE 12.1
move variables
added missing texts in changelog
fixed problem in threshold handling