Detect tag.hbs template in themes

closes #2320
- changed detection from "tag" to "tag.hbs" in "frontend.js" contrroller
Add test for tag.hbs template.

refs #2321
Merge pull request #1 from halfdan/add-test-tag

Add test for tag.hbs template.
Merge pull request #2321 from polygonix/2320-detect-tag-hbs
Bower dependency order OCD
Update system emails to come from ghost@blog.url

Closes #2145
Merge pull request #2345 from JohnONolan/emailfrom

Update system emails to come from ghost@blog.url
Do not cache 404 pages

closes #2334

- remove call to set cache-control in 404 response header
- update unit tests to expect this

Fix up unit tests
Merge pull request #2342 from dsschnau/nocache404

Nocache404
Replace SASS with assets from Ghost-UI

closes #2368
- Remove Ruby dependency (Gemfiles)
- Remove sass/fonts from core/client/assets/
- Add copy task to Gruntfile to copy over ghost-ui assets
- Install Ghost-UI via bower
- Changed .npmignore/.gitignore
- Remove grunt-contrib-sass dependency
- Remove mentions of Ruby in CONTRIBUTING.md
Merge pull request #2369 from halfdan/bower_all_the_things

Replace SASS with assets from Ghost-UI
Cleanup more sass/ruby things