Unit tests and bug fixes

0.5.0

2017-03-10

The testing release!

This adds a bunch of unit tests for almost all of the functions (println!
functions excluded) and fixes some tests found after writing them.

Breaking changes

• The short forms for payload and principal have how been switched for
  consistency
• The long form of expires is now exp for consistency

Bug fixes

• Shorthand payload options (exp, aud, etc) no longer cause a panic
• Windows builds now have a more readable name rather that the target triple
• The generate command output is now prettier

Roadmap to 1.0.0

• Final preflight checks
• Investigation into release to OS package managers
• Name change?