Implemented the templates for two new deployment UI pages.
Skeleton pages for deployment-history and deployment-contents.
The UI components of the deployment history page are all working.  The
server-side services are not yet implemented (currently returning mock
data).
Completed implementation of the deployment contents page.
Switched to Errai 2.4.0.Beta1.
Finished the implementation of the deployment history page.
Added a filters section to the deployment history page.
Added a filter to the deployment contents page.
Merge pull request #8 from EricWittmann/dtgovui-deployment-ui-enhancements

DTGOV UI Enhancements (history, expanded content pages)