Add makeExprArr, unFun.  The former generalises the way we make expression Arrows.
Add signum for ExprArr
Use <<< in preference to .
Update comment on Predicates.hs
Add ExprArr.constantRC
Comments about using ExprArr and ShowConstant in preference to old functions.
Export `toQueryArr`.
Fix warnings.
Merge pull request #46 from hesselink/export-toqueryarr

Export `toQueryArr`.
Merge pull request #45 from hesselink/fix-warnings

Fix warnings.
Add DESIGN.md
ShowConstant instances for Text and UTCTime
Merge pull request #48 from silkapp/showconstant-text-utctime

ShowConstant instances for Text and UTCTime
Allow reflection 1.5.*
Merge pull request #49 from silkapp/reflection

Allow reflection 1.5.*
Add ShowConstant:showThrough helper for defining instances in terms of other instances
TH for creating ShowConstant instances for newtypes
Merge pull request #51 from silkapp/showconstant

ShowConstant: showThrough and TH for generating instances for newtypes
ShowConstant UUID UUID
Remove duplication in ShowConstant