Create .travis.yml
Add Makefile on top
Build Status button
Create Makefile tree
Add cleanall target
Run make {all,regress,cleanall} on Travis-CI
Memo error occured on GTK/TUTORIAL
Install libgtk-3-dev package on CI
Add regress target on contrib/GTK/TEST/Makefile
Merge pull request #25 from master-q/feature/ci_contrib_gtk_tutorial

Run CI on contrib/GTK/