fix(undefined underscore)

[flobacher]

Hey! No functionality changed, only replaced the _.each by angular.forEach, because this way underscore or lodash is not required.

updated version and removed it from bower.json since they take version number from tagged releases, according to: https://github.com/bower/spec/blob/master/json.md

added angular as a dependency

also added the possibility to trigger the onBlur update via a custom event (it might be difficult to trigger a 'blur' on an input that is visually hidden)