Merge pull request #16 from ahcorde/master

Remove ~ files generated by gedit
Merge pull request #17 from ahcorde/master

Update Summary
Merge pull request #18 from ahcorde/master

ES: Codiad and Cloud9
Merge pull request #19 from ahcorde/master

fix link in cloud9 installation
Merge pull request #20 from ahcorde/master

Summary fix
Add covers