Bump version 0.6.0 -> 0.6.1

Bump version 0.5.3 -> 0.6.0

Also, some minor docs fixes.

Bump version 0.5.2 -> 0.5.3

Merge branch 'dev' (-> 0.5.2)

Version 0.5.0 -> 0.5.1

Bumpversion 0.4.0 -> 0.5.0

Bump version 0.3.10 -> 0.4.0

Bump version 0.3.9 -> 0.3.10

Bump version 0.3.8 -> 0.3.9

Lazily train the NP extractors for MUCH faster imports