Document normalize.css and blueprint-datetime.css requirements

[thisbejim]

Two details that could be added to the blueprint docs for clarity:

1. In order for all blueprint components to display as expected the user must include normalize.css in their project.
2. In order for the datetime components to display as expected the user must include @blueprintjs/datetime/dist/blueprint-datetime.css in addition to the standard @blueprintjs/core/dist/blueprint.css.

[adidahiya]

1. You're right, we should really add a section about CSS resources in the usage instructions here http://blueprintjs.com/docs/#components
2. We have a note about this for all the packages in the docs index page -- see the primary callout http://blueprintjs.com/docs/#overview

[thisbejim]

Oh yes I can see I completely missed the docs about css for other blueprint packages, my bad!