initial jolokia collector rewrite

This is a collector that we use internally for gathering metrics from Java applications (primarily Cassandra) via the Jolokia agent HTTP interface. (http://www.jolokia.org/agent/jvm.html)
We've found it a lot easier to grab large numbers of metrics in a single request using Jolokia than with direct JMX access.

The collector has recently been rewritten to enable fetching metrics from multiple agents.
It does require the pyjolokia library to function, but this is checked for on startup and mentioned in the log.
I believe this section needs to say:
```python
#!/usr/bin/env python
# This file is part of tcollector.
# Copyright (C) 2013 The tcollector Authors.
#
# This program is free software: you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or (at your
# option) any later version. This program is distributed in the hope that it
# will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
# of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
# General Public License for more details. You should have received a copy
# of the GNU Lesser General Public License along with this program. If not,
# see <http://www.gnu.org/licenses/>.
```
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