Added example to create partials using gulp-wrap

[kahwee]

Referencing #10, before I go on removing the wrapped parameter, I wrote the documentation for how to possibly use gulp-wrap to achieve partials support.

What do you think @lazd?

[lazd]

1. Partials aren't for just the browser only, they can be used in any Handlebars environment.
2. The convention in this README is to wrap module names in backticks

`[gulp-wrap]` can be used to compile partials. Just pipe the output of `gulp-handlebars` to `gulp-declare`:

[lazd]

Definitely squash so your PR doesn't include doesn't include the reverted changes (97b492f and e97ceec). If you're new to squashing, you can just do:

git reset 97b492fddb2115d489304137187230490c0f8bed~1
git add .
git commit -m "Add documentation on compiling partial for the browser using gulp-wrap."
git push origin without-wrap --force

[kahwee]

Thanks @lazd, I've made another pull request address them.

[lazd]

Superseded by #12