cache local replay metadata
https://github.com/FAForever/lobby/issues/60
descriptive variable names
use with keyword for file I/O
add docs for notification system
fix some docs
Merge pull request #69 from IDragonfire/doc/notification_system

Thank you for the contribution!
Merge pull request #68 from faf5678/develop

cache local replay metadata - Thanks for your contribution!
Excepthook properly reset inside the new excepthook function in order to prevent excepthookception.
Merge branches 'develop' and 'feature/new-patcher' of https://github.com/FAForever/lobby into feature/new-patcher

Conflicts:
	src/__main__.py