support Google Analytics subdomains and multiple top-level domains tracking
fix #513 - move GOOGLE_ANALYTICS_ID into constance
move all (new) GA settings to constance
Merge pull request #520 from groovecoder/constance-513

fix #513 - move GOOGLE_ANALYTICS_ID into constance
Merge branch 'master' into django_14
Revert "PyPI now uses CDN that's faster w/o --use-mirrors"

This reverts commit 9835cccd0e4f335decc38c0a227586aa7260e4d3.
Merge branch 'master' into django_14

Conflicts:
	.travis.yml