JS package bumps

[jacogr]

Update React & React-DOM from 15.4.1 to 15.4.2: (Aligns peer dependencies)

npm WARN react-addons-create-fragment@15.4.2 requires a peer of react@^15.4.2 but none was installed.
npm WARN react-addons-perf@15.4.2 requires a peer of react-dom@^15.4.2 but none was installed.
npm WARN react-addons-shallow-compare@15.4.2 requires a peer of react@^15.4.2 but none was installed.
npm WARN react-addons-test-utils@15.4.2 requires a peer of react-dom@^15.4.2 but none was installed.
npm WARN react-addons-transition-group@15.4.2 requires a peer of react@^15.4.2 but none was installed.

Update UglifyJS from 2.8.2 to 2.8.16: (Update deprecated package)

uglify-js@2.8.2: Significant regressions found