* Implement rawSql as a QuasiQuoter

* Remove duplicate `makeExpr`

* Simplify further, wrap more functions and add docs

* Explicitly import `mempty`

* Implement table and column name escaping

* Update module level docs

* Update docs and avoid introducing unused var

This introduces a bit more complexity into the Quasi Quoter but makes
sure that no unused patterns are introduced if they are not needed

* Add tests for column and table name interpolation

* Use `getFieldName` and `getTableName` in QQ

* Add more sqlQQ tests

* Add `fail` as a package dependency to persistent

* Add `getFieldName` and `getTableName` imports

* Use the Monad fail function

* Use `return` instead of `pure`

* Explicitly annotate `runQuery` in tests

* Update persistent ChangeLog