Many fixes from community feedback on 1.3

Bug fix

• bugfix(subscribe): make subscribe return a the same interface as Meteor.subscribe , thanks @netanelgilad & @dotansimha , #971 #975
• bugfix(reactive-context): Fixes for nested object in helpers, fixes #939 , thanks @dotansimha , #954
• bugfix(reactive-context): Refactor reactive context module, Fix tests and make necessary changes, Helpers initialization order is set by declaration order, thanks @DAB0mB , #914
• bugfix(reactive-context): bug/scope with helper name, thanks @dotansimha & @idanwe , #936
• bugfix(babel): Update angular-babel to 1.0.7 to fix debugging source maps, fixes #878 , thanks @pbastowski , 7dba912
• bugfix(reactive): digest scope when helper property is changed, thanks @netanelgilad , #959
• bugfix(angular-with-blaze): Adding blaze-html-templates as a dependency to angular-with-blaze, thanks @ozsay , #957

Code improvements

• angular-meteor-templates(chore): Move templates handle to the angular-meteor-templates, thanks @dotansimha , #924

Docs

• Many fixes to the tutorial, migration docs, API documentation and better deprecation messages, thanks @dotansimha , @sebakerckhof , @evjan , @EyalRonel , @barbatus , @jdownhower , @Njel , @allanlundhansen , @JulienMartin , @kylefox

I've also updated the 1.3 blog post