Added some code to change vlans via serial (powerconnect)

It isn't currently integrated into the rest of the codebase. Preliminary
interactive testing suggests that it works.
A bit more work on the dell serial driver

It's integrated with the rest of the haas, though hasn't really been
tested that way; the haas master doesn't have VT, and this is causing an
exception to be thrown before we get to invoking the driver.
Merge branch 'devel' into dell-serial
Merge branch 'config-file' into dell-serial
Dell driver now uses telnet.

This fixes #2, and resolves #16 by virtue of having redone the whole
thing.

It also fixes #12.
Merge branch 'devel' into dell-console

Conflicts:
	haas.cfg.example
Merge branch 'devel' into dell-console
Deleted old, commented out implementation.

This one interfaced with this switch via serial.
Added a module-level docstring to haas.dell.

It mentions future plans for SNMP, in additon to the one-line summary of
the module.
Merge pull request #28 from CCI-MOC/dell-console

Dell console driver
Merge branch 'devel' into overview-docs