admin
fix #556 - add 'gc' and 'gC' operators to toggle comments
fix #289 - bracket text object should skip escaped brackets
fix tests
revert change that made 'p' autoindent
fix #473 - implement Ctrl-W in insert mode (delete previous word)
fix #621, fix #393, maybe others :-/ - implement '[' and ']' motions; fix Ctrl-C
fix tests
prepare release