Attempt to use power-assert.

Throws the same error that it has thrown:

```
not ok 3 - "modeSwitchCapturesLogs" - test #3 in `lib/log.test.js`
  ---
  message: assert._capt is not a function
  stacktrace: TypeError: assert._capt is not a function
    at [object Object].module.exports.modeSwitchCapturesLogs (lib/log.test.js:26:18)
    at /Users/justin/code/testdouble/scripty/node_modules/teenytest/lib/user-function-async-wrapper-factory.js:10:22
    at /Users/justin/code/testdouble/scripty/node_modules/teenytest/node_modules/async/lib/async.js:718:13
    at Immediate.iterate [as _onImmediate] (/Users/justin/code/testdouble/scripty/node_modules/teenytest/node_modules/async/lib/async.js:262:13)
    at processImmediate [as _immediateCallback] (timers.js:374:17)
  ...
```

My `npm version`:

```
{ scripty: '1.2.2',
  npm: '2.14.4',
  ares: '1.10.1-DEV',
  http_parser: '2.5.0',
  modules: '46',
  node: '4.1.1',
  openssl: '1.0.2d',
  uv: '1.7.4',
  v8: '4.5.103.33',
  zlib: '1.2.8' }
```

Author: searls

package.json

@@ -30,8 +30,10 @@
   },
   "homepage": "https://github.com/testdouble/scripty#readme",
   "devDependencies": {
-    "assert": "^1.3.0",
+    "espower": "power-assert-js/espower#embedded-recorder",
+    "espower-loader": "^1.0.0",
     "intercept-stdout": "^0.1.2",
+    "power-assert": "^1.3.1",
     "semver": "^5.1.0",
     "standard": "^6.0.8",
     "teenytest": "^3.0.0",

test/safe-helper.js

@@ -1,5 +1,10 @@
+require('espower-loader')({
+  cwd: process.cwd(),
+  pattern: 'test/safe/**/*.js'
+})
+
 var decorateAssertions = require('./decorate-assertions')
-global.assert = decorateAssertions(require('assert'))
+global.assert = decorateAssertions(require('power-assert'))
 
 var log = require('../lib/log')
 

test/unit-helper.js

@@ -1,7 +1,12 @@
+require('espower-loader')({
+  cwd: process.cwd(),
+  pattern: 'lib/**/*.test.js'
+})
+
 global.td = require('testdouble')
 
 var decorateAssertions = require('./decorate-assertions')
-global.assert = decorateAssertions(require('assert'))
+global.assert = decorateAssertions(require('power-assert'))
 
 var log = require('../lib/log')