Fixed bugs.

- New aliases. They are the same as the old ones, but with "heart" instead of "health".
- Added /viewheart (player) to view the maximum number of hearts possible for the player.

Aliases can be found in Documentation page and Home page.

We fixed several bugs and added new commands.

Added:
- sethealth
- removehealth
- addhealth
- help command
- command aliases

This update fixes an issue where players could gain hearts by using negative numbers. Players must now give 1 or more hearts or else it doesn't work.