v3.1.0

• Added hunter.actions.ErrorSnooper - an action that detects silenced exceptions.
• Added hunter.load_config and fixed issues with configuration being loaded too late from the PYTHONHUNTERCONFIG environment variable.
• Changed hunter.From helper to automatically move depth and calls filters to the predicate (so they filter after hunter.predicates.From activates).
• Changed hunter.predicates.From to pass a copy of event to the predicate. The copy will have the depth and calls attributes adjusted to the point where hunter.predicates.From activated.
• Fixed a bunch of inconsistencies and bugs when using & and | operators with predicates.
• Fixed a bunch of broken fields on detached events from hunter.event.Event.detach (hunter.event.Event.function_object and hunter.event.Event.arg).
• Improved docstrings in various and added a configuration doc section.
• Improved testing (more coverage).