Added simple mesh class hierarchy.

Currently only a spherical section mesh is included.
Changing event so it fits to the provided example stations.
Adjusting test case for the event
Fixing bug when passing a single string.
Small change to the time config location.
Moved time config to global config dict.

Only one configuration object is passed to each write. Thus everything
has to be stored there.
Added an example file.

I am still changing the API and just trying to find the best way to do
it.
Added writer and example for SES3D 4.0
Changes in the station parsing.

Should ease the implementation of SAC and RESP file reading.
Station information can be read from SAC.
Cleaning up the SES3D example.
Removing the spherical section class.

It did not work out. Generalizing meshes will likely not work.
Cleaning up.
Added option to deal with rotation to the SES3D writer.
Added bounds checking to the SES3D 4.0 writer.
Swapping theta min and max.

Converting latitude to colatitude swaps min and max.
SES3D 4.0 writer: Fixing total station count
Fixing depth units in SES3D 4.0 writer.
Type conversions for the SES3D 4.0 writer
More extensive tests for the station parsing.