Create a composite strategy for case transformation.

Create a default underbarred to camel case translation followed up by ways of composing exceptions including acronyms and explicit mappings.

``` javascript
var base = startHere();
var acronyms = acronymed('npm ip ssn', { case: 'lowered' }, base);
var maps = mapped({ foo_bar_fbn: "fooBarFBN" }, acronyms);
```