for next release

-- improve documentation. Document errors.
  -- provide examples
    -- basic runSession usage
    -- intermediate usage
    -- exception handling with lifted-base
    -- explicit waits usage
    -- firefox profile usage
    -- REPL usage

for 1.0

-- add WDSettings, use WDSession as internal State type. 
-- allow settings to automatically load drivers. add modules with driver loading
functions
-- allow setting to modify HTTP headers



distant future

-- use http-conduit and attoparsec-conduit to stream JSON data. use request methods from http-types

-- use ReaderT to store WDVersion for use with implicit configurations.


misc. unsorted

-- remove temporary directory code from prepareProfile

--Use lazy ByteString where possible. patch base64-bytestring to work with lazy bytestrings