Added options.amd as a function

[alexindigo]

Allows greater flexibility for building subtemplates dependencies, current implementation allows only static list on the config. With this change dependency list could be built per template from AST or compiled code.

Thank you.

CLA's signed

[alexindigo]

@tkellen @vladikoff @jmeas @sindresorhus anything else you'd like for me to do to move this PR forward? Thank you.

[stephanebachelier]

@alexindigo Could you add some documentation in the README ?

https://github.com/gruntjs/grunt-contrib-handlebars#amd

[sindresorhus]

👍 docs/options.md needs to be updated and merge conflict fixed.

[vladikoff]

Yeap!

docs/options.md needs to be updated and merge conflict fixed.

[alexindigo]

@vladikoff @sindresorhus @stephanebachelier Updated docs and resolved conflicts.
Thank you.

[ingiulio]

👍

[vladikoff]

Excellent, thank you!

[alexindigo]

Thank you.

[alexindigo]

@vladikoff Can we create couple more versions with this change? 0.8.1 for handlebars 1.3 and 0.9.4 for handlebars 2.0, some third libraries depend on older version of handlebars and can't use 0.10.x. Thank you.