alerts: mainnet key update

 - mainnet ecdsa keypair updated to prevent abuse from previous
   owner(s).
 - client version set to 0.8.0.1 ("/SatoshiClone:0.8.0.1/")
Merge branch 'dev-0.1.3' into release-0.1.3
Merge branch 'release-0.1.3'

 - new ecdsa public key ; prevent abuse from previous owner(s). Will be used to announce important informations to users (mandatory updates, ...)
 - client version bumped to 0.8.0.1