Remove incorrect asset_path mapping

- Including 'asset_file' (the manifest) fails if asset file is itself
  templated (erb, coffee), or if asset file uses require_self.
- Use require_self if it is necessary to include javascript inside of a
  sprockets manifest file (like application.js)
Fix jasmine_helper.rb generator example

Remove the instance variable notation.
Merge pull request #130 from mcolyer/patch-2

Fix jasmine_helper.rb generator example
Remove reference to jasmine_config.rb in README
Merge pull request #129 from mcolyer/patch-1

Remove reference to jasmine_config.rb in README
Remove references to jasmine_config.rb and jasmine_runner.rb in USAGE
Merge pull request #132 from levent/bug/references

Remove references to jasmine_config.rb and jasmine_runner.rb in USAGE
Added release notes for v1.3.2
Demonstrate Gemfile definition.

Some members of our team tried to only put the gem into the :test group.  We thought we'd make the installation clearer on the Readme.

--
Adam and Steve
Merge pull request #141 from zephyr-dev/master

Improve Gemfile installation instructions.
Fix default path for :spec_helper in template
Merge pull request #147 from kmayer/fix_jasmine_helper_rb

Fix default path for :spec_helper in template