Add mixpanel and google analytics scaffolding to generated applications.

fixes #16

Changes:
* setup ENV properties for mixpanel + google analytics
* add mixpanel javascript library to track "Page Viewed" events
* update application layout to include javascript analytics code
fix syntax
relocate file
add testsuite stubs for google analytics/mixpanel
fix erb evaluation of the analytics ERB templates
release analytics branch
Merge branch 'analytics'

* analytics:
  release analytics branch
  fix erb evaluation of the analytics ERB templates
  add testsuite stubs for google analytics/mixpanel
  relocate file
  fix syntax
  Add mixpanel and google analytics scaffolding to generated applications.