Setting withdraw vesting routes w/ Beem

When you power down from an account, you can automatically route the powered-down STEEM to a different account. (or multiple accounts with multiple transactions).

Somehow Steemconnect hot-sign URL for that didn't work for me, so I did with Beem.

Account.set_withdraw_vesting_route method has also a couple of interesting parameters:

• You can set a percentage and only route a portion of the powered down vests. (percentage, float)
• You can share the VESTS as VESTS (SP) instead of liquid STEEM. (auto_vest, bool)