Rename folder tools to cli to keep it consistent with crate naming

cli/gas/main.rs

@@ -0,0 +1,24 @@
+extern crate parity_wasm;
+extern crate pwasm_utils as utils;
+extern crate pwasm_utils_cli as logger;
+
+use std::env;
+
+fn main() {
+	logger::init_log();
+
+	let args = env::args().collect::<Vec<_>>();
+	if args.len() != 3 {
+		println!("Usage: {} input_file.wasm output_file.wasm", args[0]);
+		return;
+	}
+
+	// Loading module
+	let module = parity_wasm::deserialize_file(&args[1]).expect("Module deserialization to succeed");
+
+	let result = utils::inject_gas_counter(
+		module, &Default::default()
+	).expect("Failed to inject gas. Some forbidden opcodes?");
+
+	parity_wasm::serialize_to_file(&args[2], result).expect("Module serialization to succeed")
+}