Revert react-router and striptags versions
Revert react-router and striptags versions

react-router is not upgraded because the 4.x.x branch has a very
different API and the team has said that they will continue supporting
3.x.x indefinitely.

striptags is not upgraded because webpack-uglifyjs-plugin doesn't
support libraries written in ES6 and the striptags team says it's safe
to stay on the 2.x.x branch of striptags.
openjck/distribution-viewer,openjck/distribution-viewer,openjck/distribution-viewer,openjck/distribution-viewer