Add Support for Universal Analytics

[johngroves]

Adds support for Google Universal Analytics.

[coveralls]

Coverage increased (+0.07%) to 99.248% when pulling dccfb59 on johngroves:master into ed146c4 on citruspi:master.

[coveralls]

Coverage increased (+0.07%) to 99.248% when pulling f113bc0 on johngroves:master into ed146c4 on citruspi:master.

[johngroves]

Passing here: https://semaphoreci.com/johngroves/flask-analytics/branches/master/builds/1 do you know what is causing the build to fail in Semaphore?

[minhoryang]

poke?

[citruspi]

@johngroves Nope, and the fact that the build fails on Semaphore without providing any output makes me slightly less inclined to trust the Semaphore results.

I pulled down the branch and ran the tests successfully on Python 2.7.9 and Python 3.5.0.

(citruspi-Flask-Analytics)$ python --version
Python 2.7.9
(citruspi-Flask-Analytics)$ nosetests -v                   
test_all (test_app.TestAnalytics) ... ok
test_boostrap (test_app.TestAnalytics) ... ok
test_chartbeat (test_app.TestAnalytics) ... ok
test_disabled (test_app.TestAnalytics) ... ok
test_gauges (test_app.TestAnalytics) ... ok
test_google_classic (test_app.TestAnalytics) ... ok
test_google_universal (test_app.TestAnalytics) ... ok
test_gosquared (test_app.TestAnalytics) ... ok
test_none (test_app.TestAnalytics) ... ok
test_piwik (test_app.TestAnalytics) ... ok

----------------------------------------------------------------------
Ran 10 tests in 0.130s

OK

(citruspi-Flask-Analytics) $ python --version
Python 3.5.0
(citruspi-Flask-Analytics) $ nosetests -v    
test_all (test_app.TestAnalytics) ... ok
test_boostrap (test_app.TestAnalytics) ... ok
test_chartbeat (test_app.TestAnalytics) ... ok
test_disabled (test_app.TestAnalytics) ... ok
test_gauges (test_app.TestAnalytics) ... ok
test_google_classic (test_app.TestAnalytics) ... ok
test_google_universal (test_app.TestAnalytics) ... ok
test_gosquared (test_app.TestAnalytics) ... ok
test_none (test_app.TestAnalytics) ... ok
test_piwik (test_app.TestAnalytics) ... ok

----------------------------------------------------------------------
Ran 10 tests in 0.106s

OK

I think I'm comfortable merging this in and I'll probably end up removing Semaphore CI integration if I can't get it to work properly.