fix(cli): Remove require'd process

As @soyuka reported, process does not need to be require'd and should be removed.

Closes #1

Author: jimthedev

package.json

@@ -1,6 +1,6 @@
 {
   "name": "commitizen",
-  "version": "1.0.2",
+  "version": "1.0.3",
   "description": "Git commit, but play nice with conventions.",
   "main": "index.js",
   "scripts": {

src/app.js

@@ -1,4 +1,3 @@
-var process = require('process');
 var configLoader = require('./configLoader.js');
 var cz = require('./cz.js');
 

src/cz.js

@@ -4,7 +4,6 @@ var dedent = require('dedent');
 var inquirer = require('inquirer');
 var gulp = require('gulp');
 var git = require('gulp-git');
-var process = require('process');
 var minimist = require('minimist');
 var child_process = require('child_process');