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This commit introduces the ability for accounts with the necessary privileges to slash other accounts. The amount to be slashed is controlled via the `slashPercentage`. The amount to be slashed will be calculated from the account's current Karma balance, which is the total Karma across all distributors, minus the known `slashAmount` for that account. Under the hood, it calculates the slash amount for each item (distributor or internal balance). This ensure we reduce the slash amount correctly, if a reward distributor is removed. **Example**: For example, if the account has 100 Karma and hasn't been slashed before, the account's balances would look like this: ``` rawBalance: 100 slashAmount: 0 balance: 100 ``` Therefore, `balanceOf(account)` will return `100`. If slashing burns 10% of the account's balance, then, after calling `slash(account)`, the `slashAmount` will be increased accordingly: ``` rawBalance: 100 slashAmount: 10 balance: 90 ``` Notice that `rawBalance` isn't actually a new contract property, but there's a new internal function `_rawBalanceAndSlashAmountOf(account)`, which is used by `balanceOf(account)` to determine the effective balance of an account. **Authorization** In order to slash accounts, the message sender needs to have the newly introduced `SLASHER_ROLE`. Closes #212