Update README.md

[rogerhu]

No description provided.

[renfeng]

The dependency on npm and bower had been dropped since the directory, components, is included in the source.

I'm planning to drop Polymer in the end to make the project tighter and more focused.

Will remove the following lines from studio.sh

# bower, https://bower.io/#install-bower
bower i

So, can you remove the guide on installing bower, or simply withdraw the merge request. Thanks.

[renfeng]

#16