Add support for publishing packages within a monorepo...

[the-t-in-rtf]

As @amb26 and others are urging us to move more towards using monorepos in our work, we need for fluid-publish to understand our conventions and assist us in publishing releases to npm.

It would need to be able to publish the outermost package as well as any sub-packages that are intended for separate reuse.

[amb26]

There are some notes appended to the bottom of this wiki page, updated for our discussions during Nov 2016 - https://wiki.fluidproject.org/display/fluid/Notes+on+Modularisation+of+Infusion#NotesonModularisationofInfusion-UpdatestothisDiscussionasofOctober2016

We've had some conversations with @colinbdclark in the meantime about the extra requirements on fluid-publish. It seems that an important extra one is synthesizing internal module references into the package.json of the nested projects based on some declarative information. It's already been long enough that I can't completely recall the reasoning behind this - we should start to have meetings on this topic early as the New Year starts.

[the-t-in-rtf]

Once we have something to try out, I am happy to exercise it as part of building my first monorepo (UL-111).