Fix debian repo info in README

The original example will fail because of "Permission denied" (the scope of sudo does not apply
to the stdout append). This variant will work for non-root users.

Also modified it to the best practice of adding custom repositories to their own files within
/etc/apt/sources.list.d/foobar.list
Fix current version
Add package rule to Makefile
Merge branch 'master' into develop
Version bump 0.1.3
Update changelog for 0.1.3
Merge branch 'release/0.1.3'
Merge pull request #21 from colszowka/patch-1

Fix debian repo info in README
Add travis file
Merge pull request #19 from mtahmed/master

Fix the error message when incorrect number of arguments passed.
Change Makefile to properly set GOPATH.