minify and optimize bundle

[maraoz]

This improves the size of browser bundles, especially the ones build with only cherry-picked submodules

For the original version, 1.521s to create, 564K size
For the uglified version, 4.399s to create, 260K size
For the uglified version with only util/log module 3.143s, 160K size
For the uglified version with only util/log module, after optimization 1.695s, 64K size

For the uglified version with only Address module and dependencies, after optimization 1.834s, 68K size

[ryanxcharles]

Awesome. Reviewing.

[ryanxcharles]

ACK. Confirmed to make big difference in file size, and all node/browser tests pass. We will need a server-side app to run this code and generate customizable versions of bitcore than you can run from bitcore.io just like for twitter bootstrap or jQuery.