Adds travis config.
Fix the cabal command for travis.
Condition for mtl changes to compile for 2.0.*
Tries to install haskell-src-exts by apt
Restyle & sudo fix
Install cmd-args
Fix the cmd-args package name
Silence apt
Even quiter, as it still produced to much warnings
Adds a testbuild afterwards
Silencing apt didn't work.
Adds a status image
Merge branch 'travis' into develop