make all: Built extra/stb-tester.spec

This caught me out when (manually) building an RPM for release.
pylint.sh: Ignore pylint 1.x errors regardless of the punctuation

Commit eb78c30 modified extra/pylint.sh to hide the following
messages (among others):

  assertion 'G_TYPE_IS_BOXED (boxed_type)' failed
  assertion 'G_IS_PARAM_SPEC (pspec)' failed

however on my system (Fedora 19) they appear like

  assertion `G_TYPE_IS_BOXED (boxed_type)' failed
  assertion `G_IS_PARAM_SPEC (pspec)' failed

Note the difference in punctuation: backticks instead of apostrophes.
This might be a Linux vs. BSD issue.

This commit modifies the expression to match any character instead of
apostrophes.
tests/test_stbt_batch_report_pages.py: Selenium tests for stbt reports

High-level tests to verify the dynamic behaviour of stbt batch report
pages, implemented in `edit-testrun.js` and `instaweb`. They are using
the Firefox driver only.

This commit adds three tests that exercise the following functionality:
* hide a test run;
* modify "Failure reason";
* modify "Notes".

Dependencies: `selenium` pip module and Firefox.
.travis.yml: Set up Travis CI to execute Selenium tests

Travis cannot display a GUI but we can run the tests in a headless
browser.

Configure xvfb (X Virtual Framebuffer) to imitate a monitor,
following the instructions at
http://docs.travis-ci.com/user/gui-and-headless-browsers/.
test_stbt_batch_report_pages.py: Skip tests if Selenium is not installed
tests/test_stbt_batch_report_pages.py: Pylint fixes

To pass `make check`.
Merge branch 'selenium-tests'

Closes #131.

* selenium-tests:
  tests/test_stbt_batch_report_pages.py: Pylint fixes
  test_stbt_batch_report_pages.py: Skip tests if Selenium is not installed
  .travis.yml: Set up Travis CI to execute Selenium tests
  tests/test_stbt_batch_report_pages.py: Selenium tests for stbt reports
Revert "Merge branch 'selenium-tests'"

This reverts commit 9e14f166, reversing changes made to 0f64474f.

Because the Selenium tests are failing on Travis:
https://travis-ci.org/drothlis/stb-tester/builds/22425708