Update README.md

according to BootstrapResources it seems to support both the less-resources and lesscss-resources plugin.
removed sourceMappingURL from bootstrap.css as this caused "ERROR resource.ResourceMeta  - Resource not found: /bootstrap.css.map"
Merge pull request #103 from danielrohers/master

Implemented simple breadcrumb
Merge pull request #104 from tubbynl/patch-1

Update README.md
Merge pull request #105 from abdielou/master

removed sourceMappingURL from bootstrap.css
Release version 3.1.1.2 supporting grails 2.4.0