Optimize bundle

[diogofcunha]

TODO:

• Add stats plugin
• Add needed externals
• Don't import lodash

Before:

react-dom, react-virtualized and full lodash included in the build

umd sizes after gzip:

umd/react-virtualized-tree.js 322.58 KB
umd/react-virtualized-tree.min.js 221.37 KB

After:

react-dom, react-virtualized set as externals. Importing only needed lodash operators.

umd sizes after gzip:

umd/react-virtualized-tree.js 28.05 KB
umd/react-virtualized-tree.min.js 22.08 KB

[coveralls]

Coverage remained the same at 92.529% when pulling dfe6da3 on optimize-bundle into 692177a on master.

[codecov-io]

Codecov Report

Merging #38 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #38   +/-   ##
=======================================
  Coverage   94.82%   94.82%           
=======================================
  Files          15       15           
  Lines         116      116           
=======================================
  Hits          110      110           
  Misses          6        6

Impacted Files	Coverage Δ
src/selectors/nodes.js	96.15% <ø> (ø)	⬆️
src/FilteringContainer.js	94.11% <ø> (ø)	⬆️

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