Shared fields like the database connection details will be
stored in a new class WebgoatContext.
For the moment, we create this object anew each time, but
we will eventually create it once, and pass it to the
constructor of WebSession, to provide initial values for
each user.
git-svn-id: http://webgoat.googlecode.com/svn/trunk@137 4033779f-a91e-0410-96ef-6bf7bf53c507