enable check for jasmine rake tasks

- Currently passing for jruby and rails3
fix wrong number of arguments for lambda in test

- .with syntax now accepts a block that will get called everytime the stubbed method gets called
Merge pull request #218 from jordi-pivotal/fix-test-failures

Fix for tests that failed after dependency behavior changed.

- We don't Gemfile.lock jasmine to support different environments, so we've pulled in a bunch of new versions that have slightly different behaviors. This caused a few tests to fail. 
- unpend spec that is now passing.
- Use new rspec block syntax
Merge pull request #216 from jordi-pivotal/master

Set assets prefix in assets context