Offer an option for angular app output directory

[Wtower]

Currently the output directory for the angular sub-generators is hard-coded to public/javascripts as this directory gets created by the main generator.

• https://github.com/Wtower/generator-makrina/blob/v0.5.0/generators/angular-core-service/index.js#L55
• https://github.com/Wtower/generator-makrina/blob/v0.5.0/generators/angular-component-list/index.js#L77
• https://github.com/Wtower/generator-makrina/blob/v0.5.0/generators/angular-component-detail/index.js#L67

Offer an option for this in all sub-generators, which will be automatically set from main generator in case the sub-generators get invoked by the main.