Counterwallet update on beta.counterwallet.io

Folks with who encountered some of these problems below may want to access the beta site (or wait until this code is deployed to the main site).

- pubkeys can be manually provided (a field appears if CW doesn't find it in the bip32 wallet or in the blockchain)
- signature issue for multisig transation has been fixed 
- new counterblockd with plugin system and reorganized code
- sweep works well (in case of timeouts, wait 1 min and retry, but it should work fine as-is)
- the last normal address can be removed from CW

For devs, this is what's in the box:
- counterpartyd (master)
- counterblockd (develop) 
- counterwallet (develop)