More expressive Error stack : ComponentNotFoundError

[piercus]

Hello,

Thank you for this lib.

before

        » An unexpected error was caught: Error 
      at /.../electrolyte/lib/container.js:187:18 

after

        » An unexpected error was caught: ComponentNotFoundError: Unable to create component 'parent' required by 'child' 
      at ComponentNotFoundError (/.../electrolyte/lib/errors/componentnotfound.js:7:20) 

I've followed https://stackoverflow.com/questions/783818/how-do-i-create-a-custom-error-in-javascript

[coveralls]

Coverage increased (+2.0%) to 95.517% when pulling 475581b on piercus:expressive-error-stack into d6af75b on jaredhanson:master.