Appcli

Feature
* Use mako to render docopt usage text ([`9780f98`](https://github.com/kalekundert/appcli/commit/9780f98449fbbca0d0ed8b42aefa57f4d7feb019))

Feature
* Allows keys to be arbitrary callables ([`87a0b9c`](https://github.com/kalekundert/appcli/commit/87a0b9ce73a08c816109bbbce522811ef8655cf0))

Feature
* Add an easy way to toggle boolean parameters ([`ea7ba89`](https://github.com/kalekundert/appcli/commit/ea7ba8980848a0f6c46f2d0f293769ff76490ad3))
* Add a metaclass for circumventing the constructor ([`3120f36`](https://github.com/kalekundert/appcli/commit/3120f3617ac3dad668e788ecc7ac2ca75e1cd136))
* Add callback for when parameter value is changed ([`3a37468`](https://github.com/kalekundert/appcli/commit/3a37468ac729e6d202c32059030a299bb386945d))

Feature
* Add callback for parameter access ([`7c3bcf5`](https://github.com/kalekundert/appcli/commit/7c3bcf50164b6cc8633cc39037d626abd8b724df))

Feature
* Cache parameter values ([`c320d9e`](https://github.com/kalekundert/appcli/commit/c320d9e56cfd01e965b6c48a2e68ff1496ff44c8))

Feature
* Allow multiple keys to be associated with a single config ([`556dfa4`](https://github.com/kalekundert/appcli/commit/556dfa420dff1b354f0d5f322d8b8a5747afb61a))
* Add a reload() function ([`5fdde1f`](https://github.com/kalekundert/appcli/commit/5fdde1f8221d31479a5b77685cf60ebe7a084904))
* Allow layer locations to be callables ([`ad5ad16`](https://github.com/kalekundert/appcli/commit/ad5ad16845da3ecebfe07ed5aa787634d560594c))
* Allow not_found() to take any iterable type ([`507c133`](https://github.com/kalekundert/appcli/commit/507c133ff0122dce45ccc0742cd166426c877daa))
* Print all docopt messages to stderr ([`3737b3a`](https://github.com/kalekundert/appcli/commit/3737b3af634aed54780a184679e3b69245fd1103))
* Export the lookup() function ([`9694681`](https://github.com/kalekundert/appcli/commit/9694681a33852005a48a6c609ba12af6bd56b213))
* Teach make_map() about elipses ([`9c11385`](https://github.com/kalekundert/appcli/commit/9c11385b5a6afed620d6d8ca847fba01dda5844d))
* Add ignore argument ([`476b114`](https://github.com/kalekundert/appcli/commit/476b11459a83e8d168c3000f14e88b9e1158a57f))

Fix
* Remove debug calls ([`04401f6`](https://github.com/kalekundert/appcli/commit/04401f649bb832cdd0c7829779dff684b1488783))