Changes in version 0.3.0.0

• Some performance improvements, including avoiding quadratic slowdown with left-associated binds.

• Documentation cleanup; Haxl.Core is the single entry point for the core and engine docs.

• (>>) is now defined to be (*>), and therefore no longer forces sequencing. This can have surprising consequences if you are using Haxl with side-effecting data sources, so watch out!

• New function withEnv, for running a sub-computation in a local Env

• Add a higher-level memoization API, see 'memo'

• Show is no longer required for keys in cachedComputation

• Exceptions now have Eq instances