1. Add ale.setup and ale.setup.buffer for pure Lua configuration.
2. Update many global settings to use Booleans instead of numbers to
make types easiert to work with in Lua.
3. Radically reformat documentation and fix errors to make
documentation more usable for Neovim users.
* Add support for HashiCorp Packer
* Add test for packer fmt
* Add doc for HCL/Packer
* Add link to Packer doc
* Also suggest packer fix for packer ft
* Add more links to TOC