Make None a monad
Add #value_to_a
Code comments
Add Option#+
Update README - add patterns
Update HISTORY for v0.13.0
Move method comments from README to code
Reorganize code for Result
Code indents in README
Improve README
Fix Result after code reorganization
Bump version to v0.13.1
Fix README examples
Update rspec dependency
Make rspec the rake default task
Add global convenience typdef for Success, Failure
Make the None convenience wrapper always return instance
Alias pipe with << for left association
Specs: Don't include Deterministic in global scope. Fixes #12
Add controller example