Some vim updates: polling of server and some additional hotkeys
Merge pull request #149 from shulmang/feature/vim_polling_and_additional_hotkeys

Some vim updates: polling of server and some additional hotkeys
fix doubly-defined ipc:call function

commented out the first one, will remove it if it gets in the way.
slip error message cleanup
small refactor of scm_osc_pair
add tests/core/std.xtm
C-c C-j now disconnects if supplied with a prefix arg
tidy up a couple of Emacs messages
add language switching to the Extempore REPL
add extempore-stop
even in xtlang mode, REPL should eval bind- forms as scheme
remove xtmX from runtime/scheme.xtm
remove toggle-frame-maximised from starter .emacs

it's in Emacs 24.4 now
add extempore-repl and extempore-run autoloads to starter .emacs
add helpful messages for when REPL is dead
rename define-{instrument,sampler} to bind-{instrument,sampler}

closes GH-146