Remove lodash dependency.

Include polyfill for old browsers: map, some, find, findIndex

Replaced:
_.each -> angular.forEach
_.map -> Array.map
_.some -> Array.some
_.find -> Array.find
_.findIndex -> Array.findIndex
_.copy -> angular.extend({}, …)
_.isEqual -> angular.equals
_uniq -> own implementation ATP$unique. This can be done better. 

Overall size increased by 1kb, but there is no need for 40kb lodash library.