Add stddev aggregator
wsp
Replace tabs with spaces
Remove empty module
Merge pull request #55 from silkapp/empty-module

Remove empty module
Merge pull request #56 from silkapp/export-tableexprrunner

Export TableExprRunner type, needed for writing update/delete type signatures
Design of expression arrows
Merge branch 'dev' of ssh://github.com/karamaan/karamaan-opaleye into dev
Implement orderBy.
Explain how we will change the Wire type if we make pure expressions
Unpackspec pc boilerplate
ExprArr: add Num instance.

Makes writing where/restrict expressions much nicer.
cast