work in progress implementing cljr-move-to-let
passes test, but I still want to figure out how to make the cursor end
up where we started off at
cursor in the let is the fake cursor
make test pass checking cljr-move-to-let works with constants
can `move-to-let` with empty let ex. (let [] 5)
move-to-let works with any foo-let symbol
forgot to stage test changes
update README to use ```clj for better formatting, and include docs for cljr-move-to-let
oops. ELisp uses ```cl now
note in README that it works with when-let and if-let etc
expand-let also can expand xyz-let forms
fix accidentally busted fn names
regex supports legal case of (let[])
only work for let/if-let/when-let.  Emacs' regexes were driving me nuts