DDF-961 - Adjusted post install operations to uninstall then install features followed by refresh

-also fixed css issue with header main-content divs conflicting with other divs with the same class name on the page.
-Post install order will be (1) uninstall installer feature (2) install post-install-features (3) refresh browser
Merge pull request #58 from McLucas/feature/DDF-961

DDF-961 - Adjusted post install operations to uninstall then install features followed by refresh