Implement Simple Staking as a module

The simple staking module allows validators to bond and add more stake
to their bond. It doesn't allow partial unbond and has no delegation.
The staking power per validator though is correctly reflected within the
consensus.

examples/basecoin/cmd/basecli/main.go

@@ -2,9 +2,8 @@ package main
 
 import (
 	"errors"
-	"os"
-
 	"github.com/spf13/cobra"
+	"os"
 
 	"github.com/tendermint/tmlibs/cli"
 
@@ -14,14 +13,15 @@ import (
 	"github.com/cosmos/cosmos-sdk/client/rpc"
 	"github.com/cosmos/cosmos-sdk/client/tx"
 
+	coolcmd "github.com/cosmos/cosmos-sdk/examples/basecoin/x/cool/commands"
 	"github.com/cosmos/cosmos-sdk/version"
 	authcmd "github.com/cosmos/cosmos-sdk/x/auth/commands"
 	bankcmd "github.com/cosmos/cosmos-sdk/x/bank/commands"
 	ibccmd "github.com/cosmos/cosmos-sdk/x/ibc/commands"
+	stakingcmd "github.com/cosmos/cosmos-sdk/x/staking/commands"
 
 	"github.com/cosmos/cosmos-sdk/examples/basecoin/app"
 	"github.com/cosmos/cosmos-sdk/examples/basecoin/types"
-	coolcmd "github.com/cosmos/cosmos-sdk/examples/basecoin/x/cool/commands"
 )
 
 // gaiacliCmd is the entry point for this binary
@@ -77,6 +77,11 @@ func main() {
 	basecliCmd.AddCommand(
 		client.PostCommands(
 			ibccmd.IBCRelayCmd(cdc),
+			stakingcmd.BondTxCmd(cdc),
+		)...)
+	basecliCmd.AddCommand(
+		client.PostCommands(
+			stakingcmd.UnbondTxCmd(cdc),
 		)...)
 
 	// add proxy, version and key info