move helpers into the directive file

this is to solve the following problem:
directive.js defines the angular module
helpers.js refers to the angular module (re-opens it to add a factory)
the load order of the two (in our build system) is nondeterministic
this caused a race-condition, throwing a js exception IFF helpers.js was loaded
before directive.js

rather than fixing it properly I am fudging it by moving the factory into
directive.js

@hitupalex
add build artifacts