Use trusty beta for Travis builds

This allows gh-pages to work. Something changed in the precise VMs that prevents the git clone gh-pages uses from working correctly.  See https://github.com/travis-ci/travis-ci/issues/4942

On my fork, this change allowed the gh-pages deploy to succeed.

Fix library SVGs

This reverts commit 321839ca.

Asset load: use asset's data format, not default

Override callback for monitor checked state 

Show workspace before triggering resize

Check if blocks exists before updating values

Hide overflow-y on gui container

Update css-loader to the latest version 

Update style-loader to the latest version 

Update autoprefixer to the latest version 

Put letter blocks back at the end of the sprites list

Use PureComponent and remove incorrect shouldComponentUpdate call

Use immutable maps for the monitor state in gui