Release 2.7.0

* Support for many more filetypes
* Sort out race condition when using utility functions directly
* Fixup undo support when commenting results in cursor moves
* Refactor comment insertion code

Release 2.6.0

* Refactor code to run as autoload plugin
* Add lots of community contributed file types
* Fix several languages with idiosyncrasies
* Improve interoperability with other vim settings
* Improve handling of ranges
* Improve help documentation
* Cleanup and fix vimscript issues

Add NERDToggleCheckAllLines option to NERDCommenterToggle (#334)

Udate version and date strings

Add multi-line comments for Elm (#283)

Technically the minimum necessary syntax for block comments requires
only a single hyphen (`-}`, `{-`), but I have found that using a double
hyphen plays a bit more nicely with the elmcast/elm-vim auto-formatting.
Further, uncommenting when using the single dashes leaves an extra level
of indentation (again, when using elmcast/elm-vim).

Bump release number for the benefit of plugin managers that update to…

… tags

update version to 2.2.3

switch to version 2.2.2

switch to 2.2.1

switch to version 2.2.0