`capitalize` rules are too aggressive

[GavinJoyce]

Looking at the tests and implementation, it seems that characters following forward slashes are meant to be capitalized:

"privateDocs/ownerInvoice".capitalize() => "PrivateDocs/OwnerInvoice"

This also currently happens for multiple forward slashes though which seems like a bug to me:

"the url is http://www.ember.com/".capitalize() => "The url is http://Www.ember.com/"
(note the Www)

[GavinJoyce]

@locks pointed me to the RFC to deprecate Ember.String and supporting issue.

I'll read those and come back with a plan

[NullVoxPopuli]

I've been using change-case https://github.com/blakeembrey/change-case

does that have better behavior? (or more customizable behavior?)

[locks]

I think that's a good enough alternative now that @ember/string isn't a core module.