WIP
merge master
expose all helper interfaces
initial docs index, and query types docs
Formatting
Update query-types.md
WIP query helpers docs
Merge branch '39-imprv-docs' of github.com:goodybag/mongo-sql into 39-imprv-docs
link to query helpers for each query type
lowercase all links
forgot full link
orReplace through columns
revise columns example
definition
typo
distinct
expression
from
function
group by and if exists