use gem-maven-plugin and exclude unnecessary resources
include gemspec files
exclude gems from test resources (small speed up)
Merge pull request #36 from code-distillery/use-gem-maven-plugin

use gem-maven-plugin and exclude unnecessary resources
Fix gem dependencies

gem dependencies are only downloaded at compile time, usage of the plugin
does not trigger dependency download or use of the gem repo
Add backwards compatibility properties

Add relativeOutputDirectory to the Resource class
Add top level sassSourceDirectory, includes, excludes, relativeOutputDirectory, and destination
properties which are used if no resources are specified
Update notice and license for release
[maven-release-plugin] prepare release sass-maven-plugin-1.1.1
[maven-release-plugin] prepare for next development iteration
Updated README.md