* cleanup: get the include and lib path from r2
* clean up of the main project file
* check if r2 is available
* corrected r2 binary name m(
* qmake error if libr not found
Because the project won't build if r2 or the paths are not found emit
an error
* removed comments and unused variable
* Add 'make install' for AppImage
* Use 'make install' in travis build
