Fixed smaller Alert bugs.
Dogecoin:
* fixed alert signature _alert_key
* updated subsidy to support 145000 hardfork
* updated nextWorkRequired to support hardfork

Tested and works.
The Inventory/Peer/TransactionFilter changes connected tot he BloomFilter patch caused transactions to not be relayed (or relayed as invs) FIXED!
Merge branch 'master' of https://github.com/libcoin/libcoin