Multiple changes to support vaulted passwords in s-ramp when deployed to
EAP.  The wagon and cli now prompt when credentials are missing.  The
s-ramp installer now uses vaulted passwords in config files where
appropriate.
UI changes to support signing of saml assertions and vaulted passwords
in config files.
Merge pull request #319 from EricWittmann/dtgov-83-vault

(dtgov-83) Support for vaulted passwords