implement acceptance tests for dashboard page

Use spinach for acceptance tests
https://github.com/codegram/spinach#readme

Cover only the major features of the page.

Run them with

    spinach
travis tweaks and working local coverage
stop seeding DB on travis
add a script for running unit tests
scopes belong to ORM, move them back there
make sure extensions are included before scopes
more reliable Sunspot boot checks
use under construction logo
remove placeholder images
add a footer with "Hosted by Plus.hr"
fix styling for blog
add factories for blogs
prettify seeds