Profile automation for tests + Travis build.

Incidentally fix a regex that generates 'nothing to repeat' error on Python
2.7.8.
Profile automation for tests + Travis build.
List python-lxml contents
Use system site packages
Maybe add python3-lxml?
Improve test.sh
Merge branch 'tests4' into tests

Conflicts:
	.travis.yml
	test.sh
Fix installs in travis.yml
Fix bad merge
How to create test_profile_skeleton.
Remove some lines from extensions.json and reindent.
Merge branch 'reddit-rule' of https://github.com/semenko/https-everywhere into tests
Addon-sdk as a submodule.
Use addon-sdk submodule
Remove addon-sdk install from travis
No user install
Merge pull request #421 from jsha/tests

Profile automation for tests + Travis build.