enable history usage

as stated here https://github.com/Merovius/shellex/issues/14#issuecomment-23702019 it's not fully working. currently I need to push an arrow key to let shellex behave properly, but commands get written to the historyfile (as inspried by https://github.com/Merovius/shellex/issues/14#issuecomment-22812163 ) and get read (fc -R in conf/90-hist)