multiple bower files

Example
```javascript
bower: {
  buildDev: {
    options: {
      argetDir: './',
      install: true,
      cleanTargetDir: false,
      verbose: true,
      cleanBowerDir: true,
      layout: 'byComponent',
        bowerOptions: {
          forceLatest: true,
          production: false
        }
    },
    src: [
      '**/bower.json',
      '!**/node_modules/**/*',
      '!**/bower_components/**/*'
    ]
  }
}
```
return working directory

return working directory
fix typo

fix typo