RC1 of 4.8.0

version 4.7.0

Merge pull request #454 from martinfleis/shapely_dep

revert shapely hard dependecy

Merge pull request #457 from ljwolf/alpha-multipolygon

Filter holes from alpha shape returns

Merge pull request #450 from sjsrey/master

DOCS: Gabriel and related enhancements

version 4.5.1.post2

version 4.5.0