dwarftherapist.pro: Remove QMAKE_CXX

All the qmake functions are broken; none can actually test for an empty
variable.
Add .travis.yml, build out of bin
Merge branch 'gitignore' into DF2014
Merge branch 'share' into DF2014
Merge branch 'stderr' into DF2014
Merge branch 'travis' into DF2014
Merge branch 'unused_decls' into DF2014