Update release files in preparation for Pyrseas 0.10.0.

Update release files in preparation for Pyrseas 0.9.1

Update release and documentation files for Pyrseas 0.9.0.

Update release files for Pyrseas 0.8.0.

Update release files for 0.7.3.

Update release files for 0.7.2.

Update release files for 0.7.1.

Update release files for 0.7.0.

Update release files for 0.7.0beta

Update release files for 0.6.1.