updating to work with grunt v0.4.0rc5.

this should get us to rc5 compat.

### Changes

- [x] remove `cwd`, `flatten`, `minimatch`, `processName` options; can be controlled by grunt multi-task config modifiers now.
- [x] new examples and docs.
- [ ] new tests that check integration with grunt multi-task config modifiers. (ie cwd, flatten, expand, etc)

### Testing/Install Now

```shell
npm install ctalkington/grunt-contrib-copy#patch4 // shorthand node >= v0.8.17
npm install https://github.com/ctalkington/grunt-contrib-copy/archive/patch4.tar.gz
```