Update exa.py

- delay request are support now. ex. ?> sleep(5)
- support NOTICE now. (for secret message)
- now show clear exception
- increase MAXIMUM_SPEAK_CHANCE 3 to 4
Update exa.py

- Remove unused code.
Update exa.py

fix
Update exa.py

- Delayed-Request의 encoding 문제 해결
Merge pull request #5 from EcmaXp/master

Fix / Add New Features EcmaXp Api