Implement Lateral Joins#22

Open

jeredmasters wants to merge 5 commits intobettyblocks:masterfrom

jeredmasters:master

Commits on Apr 23, 2018

Added support for lateral joins
jeredmasters
committed

Commits on Apr 24, 2018

implemented lateral aliases
jeredmasters
committed
Added another test, added documentation
jeredmasters
committed
fixed typo
jeredmasters
committed
added more infor to read me
jeredmasters
committed