Code revision, fixed bug with error output

-Moved database selection stuff out of the UserBean.
-Made use of the QueryResult class by using it as the default way to get
a data set bakc from the connection.
- The QueryResult now holds whether the query was malformed, and the
exception message.
- Fixed the menu bars home button.
- Fixed the database selection menu such that there is only the company
database (and it is automatically selected)
- Removed the check on whether the query was correct or incorrect. It
didn't work correctly. Incoming new version.
Merge branch 'master' of https://github.com/wholton/SQLTutor