Given a key `/:foo/:bar`, the find mechanism was incorrectly picking
the separator character as part of the key name (`foo/`).
This caused incorrect match between expected name (`foo`) and the
one obtained.
When the key name was extracted from the named parameter, the size
of the returned key was not compensated, given that we move +1 positions
to avoid having ':' as part of the key.
This is now corrected by reducing the key size one shorter to
compensate.
Fixes Issue #2
Extract Radix Tree implementation from `Beryl` project into an
standalone library to facilitate usage by other developers.
- Move `Tree`, `Node` and `Result` into `Radix` namespace
- Clenaup standalone README and describe usage
