for next minor releases

-- add special web-driver specific FF profile setters, either as special
functions or via documentation

-- add opera config

-- improve documentation. Document errors better. Provide more
module introductions
  -- provide examples
    -- basic runSession usage
    -- intermediate usage
    -- explicit waits usage
    -- firefox profile usage
    -- REPL usage


for 1.0

-- overload WD commands in typeclass
-- 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



miscellaneous unsorted

-- 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.