Basic RPC and CLI Queries (#77)

- Adds ethermint query command (`emintcli query ethermint <query>`)
    - Supports block number, storage, code, balance lookups
- Implements RPC API methods `eth_blockNumber`, `eth_getStorageAt`, `eth_getBalance`, and `eth_getCode`
- Adds tester utility for RPC calls
    - Adheres to go test format, but should not be run with regular suite
    - Requires daemon and RPC server to be running
    - Excluded from `make test`, available with `make test-rpc`
- Implemented AppModule interface and added EVM module to app
    - Required for routing
- Implements `InitGenesis` (`x/evm/genesis.go`) and stubs `ExportGenesis`
- Modifies GenesisAccount to match expected format

cmd/emintcli/main.go

@@ -1,6 +1,8 @@
 package main
 
 import (
+	"github.com/cosmos/ethermint/rpc"
+	"github.com/tendermint/go-amino"
 	"os"
 	"path"
 
@@ -10,7 +12,6 @@ import (
 	sdk "github.com/cosmos/cosmos-sdk/types"
 
 	emintapp "github.com/cosmos/ethermint/app"
-	"github.com/cosmos/ethermint/rpc"
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"
 	"github.com/tendermint/tendermint/libs/cli"
@@ -43,7 +44,7 @@ func main() {
 	rootCmd.AddCommand(
 		sdkrpc.StatusCommand(),
 		client.ConfigCmd(emintapp.DefaultCLIHome),
-		// TODO: Set up query command
+		queryCmd(cdc),
 		// TODO: Set up tx command
 		// TODO: Set up rest routes (if included, different from web3 api)
 		rpc.Web3RpcCmd(cdc),
@@ -59,6 +60,24 @@ func main() {
 	}
 }
 
+func queryCmd(cdc *amino.Codec) *cobra.Command {
+	queryCmd := &cobra.Command{
+		Use:     "query",
+		Aliases: []string{"q"},
+		Short:   "Querying subcommands",
+	}
+
+	// TODO: Possibly add these query commands from other modules
+	//queryCmd.AddCommand(
+	// ...
+	//)
+
+	// add modules' query commands
+	emintapp.ModuleBasics.AddQueryCommands(queryCmd, cdc)
+
+	return queryCmd
+}
+
 func initConfig(cmd *cobra.Command) error {
 	home, err := cmd.PersistentFlags().GetString(cli.HomeFlag)
 	if err != nil {