There is no need to have a dupplicate file for the bin called bower-installer and bower-installer.js, we can specify a name for the bin to symlink to the js file, and also updated the version in order for npm to updated properly

fixing package.json bin reference
Merge pull request #5 from mitermayer/master

No need to have duplicate bower-install and bower-install.js and updated package.json so that npm can get the latest package