Added prod & dev build scripts to reduces bundle size in production

[ankibalyan]

• Loading separate file based on NODE_ENV
• Added terser plugin for production
• Removing PropTypes from production by using react-remove-prop-types Babel plugin
• Removing dev specific console warning from the production build

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[ankibalyan]

Fixing #70

[ankibalyan]

Minified file reaches to 32K from earlier un-minified file size of 67K.
Gzip size 9.93KB
It will also reduce further more ~3K size in production mode when it'll be added to other applications.

[iamdarshshah]

Good to go! thanks @ankibalyan

[ankibalyan]

@siddharthkp added conditions for removing console warning for production build via a check for process.env.NODE_ENV !== 'production' which gets replaced at the build time..

but I'm not sure if you want to use this process.env.NODE_ENV !== 'production' specific or something like reach-ui as __DEV__.
we can't use __DEV__ as it is already being used by reach-ui components.

[ankibalyan]

Also, not sure if we want to hide all the warning messages for the production build, let me know if I've to eliminate few of them.