Add test stub to adapter blueprint

Fixes #1702
Merge pull request #1703 from jgwhite/adapter-blueprint-test

Add test stub to adapter blueprint
Fix the /tests URL in IE8

IE8 does not sent a text/html header, so tests don't load unless we
allow */* requests to fetch the test file.
Merge pull request #1707 from mixonic/ie8-mf-do-you-speak-it

Fix the /tests URL in IE8
Make blueprintLookupPaths return [] outside projects

Fixes #1684
Upgrade broccoli-ember-hbs-template-compiler to 1.6.1
Merge pull request #1710 from quaertym/master

Upgrade broccoli-ember-hbs-template-compiler to 1.6.1
Merge pull request #1708 from jgwhite/blueprint-lookup-paths-outside-projects

Make blueprintLookupPaths return empty array outside projects