Print most data types
Add basic logging.

\Myna\Log::info and \Myna\Log::debug take any number of arguments and
log them using error_log. Be sure to set \Myna\Log::$enabled to true to
enable logging.

Sprinkled some basic logging around various classes.
Fix bug with is_sticky

Missing return statement. Added some tests for this.
Enable logging in the demo
Sticky setting defaults to true.
Merge branch 'feature/logging' into develop
Merge branch 'release/0.1'