Add abolish.vim

@Bestra  made these; we need to get Adam signed out of the pairing machine :smile: 

## Abolish is awesome

- [Coerce](https://github.com/tpope/vim-abolish#coercion)  from camelCase to snake_case and more with `crc` or `crs` in normal mode

- [Subvert](https://github.com/tpope/vim-abolish#substitution) multiple matches with bash-style brace expansion.  `%Subvert/{add,attach}/{remove,detach}` will change `addListener` and `attachListener` to `removeListener` and `detachListener` in one shot.