(doc) Added overview to README.
(doc) Added examples to README.
Merge pull request #24 from reem/doc/README

Wrote a better README with Examples
(cleanup) Re-exported most commonly used names directly from iron.
(cleanup) Fixed example to use new imports.
(fix) Undid temporary hack for travis.
Merge pull request #26 from reem/cleanup/names

(cleanup) Re-exported most commonly used names directly from iron.
(doc) Documented ingot::Status
(doc) Documented Ingot trait.
(doc) Documented Ingot trait methods.