Updates to ES6 + Rollup#1

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ashwell wants to merge 15 commits intodevfrom

Commits on Dec 31, 2015

Added browserify and babel
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Commits on Jan 2, 2016

Started creating "assign" functionality + API file.
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Commits on Jan 4, 2016

Created some test stubs for assign functions
ashwell
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Commits on Jan 5, 2016

WIP: Created some more tests and various helper modules
ashwell
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Commits on Jan 6, 2016

WIP from today, looking at moving to rollup tomorrow
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Commits on Jan 13, 2016

Added some browser testing tools.
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Commits on Jan 17, 2016