Revert "Remove travis badge"

This reverts commit c596bfa1fdf66eda819f50db65e16c805753c3f2.
Update README.md to mention that nightly is necessary
Move profile creation into lib/profile (fix #187)
improve profile log messages
improve code style
Fix --profile handling
Rewrite --profile tests
Merge pull request #202 from johannhof/master

Move profile creation into lib/profile (fix #187) r=erikvold
Adding a notification for irc.mozilla.org#jpm
Closes #203 exit code 1 if tests fail, and separating the addon tests