Minor improvements to Applications application

Summary:
I missed these in review, but here are a couple of tweaks:

• Call setWorkflow(true) on the actions. This makes the dialogs pop up on the same page with Javascript if it's available.
• When the user installs/uninstalls an application, send them back to the application's detail page, not the application list.

Test Plan:

• Uninstalled an application (saw dialog, got sent back to detail page).
• Installed an application (saw dialog, got sent back to detail page).
• Canceled an application uninstall.

Reviewers: Afaque_Hussain

Reviewed By: Afaque_Hussain

CC: aran

Differential Revision: https://secure.phabricator.com/D4762