no more data-hiding, expose prototype on export
expose prototype of Read/WriteStreams, no create()
missing `var error` decl
extract Batch to separate file
reorganise util
add failing test for deferred chained batch
use deferred-leveldown to handle deferred open
Merge branch 'expose'
Merge branch 'deferred-leveldown'
style tweakages
no more `errors.`, use errors directly
minor niggles