Add callback for customising yaml loading

[sferot]

No description provided.

[ahgittin]

good refactor @sferot . i note you have an ICLA so this is good to go.

heads up, @tbouron has been spiking angularjs decorators which should provide an easier pattern to override/customize. if you are wanting to override this you could try that and let us know how it goes!

merging

[ahgittin]

actually this is giving errors when i run it:

TypeError: this.$q.defer is not a function
    at BlueprintLoaderApiProvider.loadBlueprint (blueprint-loader-api.provider.js:51)

will try to fix but if i can't i'll have to revert

[ahgittin]

@sferot fix pushed, but pls check it's what you intended

65d3740

[LudoPL]

Thanks @ahgittin for the merge and the fix
@sferot is in holidays since last wednesday, he will come back on the 12th.
If I have the time week I may try to look at it (but not sure).