solidity compiler and contract metadocs integration

* common/compiler: solidity compiler + tests
* rpc: eth_compilers, eth_compileSolidity + tests
* fix natspec test using keystore API, notice exp dynamically changes addr, cleanup
* resolver implements registrars and needs to create reg contract (temp)
* xeth: solidity compiler. expose getter Solc() and paths setter SetSolc(solcPath)
* ethereumApi: implement compiler related RPC calls using XEth - json struct tests
* admin: make use of XEth.SetSolc to allow runtime setting of compiler paths
* cli: command line flags solc to set custom solc bin path
* js admin api with new features debug and contractInfo modules
* wiki is the doc https://github.com/ethereum/go-ethereum/wiki/Contracts-and-Transactions

core/state/state_object.go

@@ -138,9 +138,12 @@ func (c *StateObject) setAddr(addr []byte, value interface{}) {
 }
 
 func (self *StateObject) GetStorage(key *big.Int) *common.Value {
+	fmt.Printf("%v: get %v %v", self.address.Hex(), key)
 	return self.GetState(common.BytesToHash(key.Bytes()))
 }
+
 func (self *StateObject) SetStorage(key *big.Int, value *common.Value) {
+	fmt.Printf("%v: set %v -> %v", self.address.Hex(), key, value)
 	self.SetState(common.BytesToHash(key.Bytes()), value)
 }