Closes #176.

Also bump version for next maint-1.4 release.
is_closed works without help from GEOS.
Merge remote-tracking branch 'origin/master' into maint-1.4

Conflicts:
	CHANGES.txt
Note changes and bump version.
Remove is_closed from 3.0.0 impl.
Remove isClosed from 3.1.0 impl.
Fixup for impl.
Merge pull request #184 from Toblerity/maint-1.4

Maint 1.4