chore(gen:deps): change from ngmin to ngAnnotate

ngmin is being deprecated in favor of ngAnnotate. ngAnnotate is much faster, better maintained, and covers more use cases.

the ngmin api is a subset of the ngAnnotate api, so there should be no breaking changes. Closes #59
Merge pull request #73 from jimthedev/master

chore(gen:deps): change from ngmin to ngAnnotate