add .bowerrc file pointing to bower_components
allow for null linkValue
fix usage instructions
Merge pull request #49 from csantero/readme-update

fix usage instructions
Merge pull request #47 from csantero/null-link

allow for null linkValue
Merge pull request #46 from csantero/bowerrc

add .bowerrc file pointing to bower_components
Merge branch 'master' into links_with_type