Find Windows installer using %SYSTEMDRIVE%\vagrant

 - Remove dependency on VirtualBox share existing, and instead rely on Vagrants behavior with
   automatically creating a synced_folder at c:\vagrant

Fixes #73.
Closes #75.
Use machine hostname for q_database_host

This patch uses the machine hostname as the value for `q_database_host` instead
of `localhost`. This solves a couple of failues in PE components that talk to
the database.

Fixes #74.
Update CHANGELOG and version for 0.9.5