Added support for custom exclusions in grails configuration:

grails.build.yuiminify.js.excludes = "one,two,three..."
grails.build.yuiminify.css.excludes = "one,two,three..."

As expected, these are in Ant syntax.
Apparently my editor is configured in a suboptimal fashion.
Minor format change.
Added dependency on bails plugin to help with relases.
[RELEASE: 1.5]
[POST-RELEASE: 1.5 -> 1.6-SNAPSHOT]
Updated readme to include new exclude config options.
Whitespace cleanup
Updated README to show correct version number.