Fix doc path in MANIFEST.in

Signed-off-by: Martin Raspaud <martin.raspaud@smhi.se>
Add a test to read tle from file.

Signed-off-by: Martin Raspaud <martin.raspaud@smhi.se>
Cleanup the testfiles.

Signed-off-by: Martin Raspaud <martin.raspaud@smhi.se>
Change to version file and bump up to v0.3.0

Signed-off-by: Martin Raspaud <martin.raspaud@smhi.se>