Reduce bundle size by eliminating extraneous dependencies.

[Shaptic]

The following can/should be replaced with native functionality to the extent to which its possible:

• lodash in non-developer environments (Removes all non-dev usage of lodash to minimize bundle size #822)
• es6-promise everywhere (Drop Promise polyfill, as its well-supported natively in all environments. #823)
• detect-node by removing places we need conditional behavior (Drop detect-node dependency by coalescing eventsource inclusion #831)
• drop polyfills that we aren't using (Improve dependency management #825)
• move developer dependencies into the appropriate category (Improve dependency management #825, Upgrade all dependencies to latest versions. #829)
• urijs aside from template usage (Investigate and drop urijs as a dependency. #827)

[Shaptic]

Marking as done just for bookkeeping purposes, since #827 is the last task and is ready to be merged, it just needs a bit of discussion/review.

[silence48]

You might want to checkout my branch called "bufferless" on my fork. it utilizes a class called browserbuffer that uses uint8 in the backend. eliminating the buffer polyfill, however not all tests are passing yet.