* Vulnerability in light client proxy
When calling GetCertifiedCommit the light client proxy would call
Certify and even on error return the Commit as if it had been correctly
certified.
Now it returns the error correctly and returns an empty Commit on error.
* Improve names for clarity
The lite package now contains StaticCertifier, DynamicCertifier and
InqueringCertifier. This also changes the method receivers from one
letter to two letter names, which will make future refactoring easier
and follows the coding standards.
* Fix test failures
* Rename files
* remove dead code
The certifier package is renamed to light. This is more descriptive
especially in the wider blockchain context. Moreover we are building
light-clients using the light package.
This also adds godocs to all exported functions.
Furthermore it introduces some extra error handling. I've added one TODO
where I would like someone else's opinion on how to handle the error.