Refactor setting of default values for assets_opts
Minor refactor for setting default assets_opts values that default to existing values
Fix plugin options handling

Make non-compiled case not use :compiled_* options.

Handle case where plugin is called multiple times with different
options.

Try to make sure every plugin value is frozen.

No longer override inherited.  The assets_opts hash itself is
frozen, as should be all of the values in the hash, so you
shouldn't be able to modify the subclass and have the values
affect the parent hash.

Add specs for testing plugin options, specifically how the hash
values are merged and how the paths are computed.
Have Roda#assets not include links if some asset type is compiled, but given asset type is not

Previously, Roda#assets would use a bogus link in such cases.
Don't raise error when yuicompressor is installed but it can't find java
Escape attribute values in Roda#assets
Add more specs for the asset plugin
Update gemspec

Add spec views and assets files to gem.

Add sass and coffee-script dev dependencies to gem.

Set gem name and version back to master branch values.