freshen up
support escaping + tests
fix link to mongo query language
use single arrows for results in readme
add readme sections: escaping column names, changelog
put raw sql in parentheses to support subqueries
simplify tests for escaping
better name
change comment headings
big changes
remove comment
improve tests and add tests for subqueries
improve code and wording
return criterion arguments which are sql fragments unmodified
support $and
add and improve tests
escape sql produced by values which are sql fragments
test row-wise comparisons
improve some comments
add compiled js