Adds:
- Employer can now give permissions to the employee.
- Employer can now set custom position for the employee.
- bstats
- update checker

Changes:
- The info page of the company can also show the label of position.
- Company name can now includes spaces. (Use _ instead of space when executing command /myc found <company>)

Fixes:
- the problem that the company still can't be disbanded after removing all the chestshop.
- the error spamming when the item of the chestshop is not specified
- the error from placeholders after disbanding the company

How to create position:
1. Found a company, creating position is only for employer.
2. execute /myc position add <position id> [label] to create position, [label] is optional.
3. To set the position for the employee, execute /myc position set <player> <position>
4. To change the label of the position, execute /myc position setlabel <position> <label>
5. Reminder: the label name supports including spaces, just use _ instead of space