Colmet

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- Saved metrics in new HDF5 file if colmet is reloaded in order to avoid HDF5 data corruption
- Handled HUP signal to reload ``colmet-collector``
- Removed ``hiwater_rss`` and ``hiwater_vm`` collected metrics.

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- New metrics ``hiwater_rss`` and ``hiwater_vm`` for taskstats
- Worked with pyinotify 0.8
- Added ``--disable-procstats`` option to disable procstats backend.

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- Divided colmet package into three parts

- colmet-node : Retrieve data from taskstats and procstats and send to
collectors with ZeroMQ
- colmet-collector : A collector that stores data received by ZeroMQ in a
hdf5 file
- colmet-common : Common colmet part.
- Added some parameters of ZeroMQ backend to prevent a memory overflow
- Simplified the command line interface
- Dropped rrd backend because it is not yet working
- Added ``--buffer-size`` option for collector to define the maximum number of
counters that colmet should queue in memory before pushing it to output
backend
- Handled SIGTERM and SIGINT to terminate colmet properly

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- Added options to enable hdf5 compression
- Support for multiple job by cgroup path scanning
- Used Inotify events for job list update
- Don't filter packets if no job_id range was specified, especially with zeromq
backend
- Waited the cgroup_path folder creation before scanning the list of jobs
- Added procstat for node monitoring through fictive job with 0 as identifier
- Used absolute time take measure and not delay between measure, to avoid the
drift of measure time
- Added workaround when a newly cgroup is created without process in it
(monitoring is suspended upto one process is launched)

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- Conception