RAML client package manifest

[blakeembrey]

We need a way to specify an external manifest file that can be used for metadata throughout generated packages. This is something that's useful to all languages and isn't particularly tied to code generation. For example, some things that should be specified:

• Git url
• Author name
• Issues url
• License name
• License file
• Publishing options for each language package (e.g. will the JS client go to NPM, Bower or just local)
• Module name

There should probably be specific overrides for every language too. So global manifest and drill down for each language where things like the module name can change.

[blakeembrey]

This is supported in the stand-alone generator project. Just need to incorporate the changes into the JavaScript codebase.