First commit of obspy/mchedr module
Registering obspy/mchedr through setup.py
Strip whitespaces from station name
Append secondary phases only if phase string is non-empty
Inverse catalog filter.
- Catalog.filter() can now return inverted results, if "inverse" is passed
  as an argument.
- Code reorganization for easier readability
obspy.mchedr: check if a pick is on the next day
Added a very basic version of obspy.station.

Aims to provide a hierarchical object structure modelled after
StationXML. Will hopefully be able to read and write from StationXML,
SEED, XSEED, and RESP.
Added Operator, Person and PhoneNumber classes.
Added ExternalReference class
Added inventory object.

Also some more work on the station object.
Added StationXML documentation + definition.
Renamed Inventory to SeismicInventory
Added basic tests to obspy.stations
Skeletion of a StationXML reader.
Merge branch 'master' into obspy.station
Added minimal StationXML test file
Started implementing reading and writing StationXML files.
Reading and writing the minimal StationXML works.

Implemented the basic structure for reading and writing to and from
inventory objects.
Fixing inventory test.
Added writing of ObsPy module tags to StationXML.