feat(espower-loader): use process.cwd() by default

README.md

@@ -33,7 +33,6 @@ where `enable-power-assert.js` somewhere in your project is,
 
 ```javascript
 require('espower-loader')({
-    cwd: process.cwd(),
     pattern: 'test/**/*.js'
 });
 ```

index.js

@@ -20,6 +20,7 @@ var pathToMap = {};
 
 function espowerLoader (options) {
     'use strict';
+    options = extend({ cwd: process.cwd() }, options);
 
     var patternStartsWithSlash = (options.pattern.lastIndexOf('/', 0) === 0);
     var separator = patternStartsWithSlash ? '' : '/';

test_loader/enable-power-assert.js

@@ -1,22 +1,4 @@
 require('..')({
-
-    // directory where match starts with
-    cwd: process.cwd(),
-
     // glob pattern using minimatch module
-    pattern: 'test/tobe_instrumented/**/*.js',
-
-    // options for espower module
-    espowerOptions: {
-        patterns: [
-            'assert(value, [message])',
-            'assert.ok(value, [message])',
-            'assert.equal(actual, expected, [message])',
-            'assert.notEqual(actual, expected, [message])',
-            'assert.strictEqual(actual, expected, [message])',
-            'assert.notStrictEqual(actual, expected, [message])',
-            'assert.deepEqual(actual, expected, [message])',
-            'assert.notDeepEqual(actual, expected, [message])'
-        ]
-    }
+    pattern: 'test/tobe_instrumented/**/*.js'
 });