Add license file to csslib so we can upload directly from the bleeding_edge

Add license file to csslib so we can upload directly from the bleeding_edge
directory.

R=terry@google.com

Committed: https://code.google.com/p/dart/source/detail?r=31030

[terry, 2013-12-10 17:45:36]

lgtm

[Siggi Cherem (dart-lang), 2013-12-10 17:50:20]

Committed patchset #1 manually as r31030 (presubmit successful).

[nweiz, 2013-12-10 19:27:41]

On 2013/12/10 17:50:20, Siggi Cherem (dart-lang) wrote:
> Committed patchset #1 manually as r31030 (presubmit successful).

We don't usually have a LICENSE file directly in pkg packages, since they're
usually published via tools/publish_pkg.py.

[Siggi Cherem (dart-lang), 2013-12-10 21:04:57]

On 2013/12/10 19:27:41, nweiz wrote:
> On 2013/12/10 17:50:20, Siggi Cherem (dart-lang) wrote:
> > Committed patchset #1 manually as r31030 (presubmit successful).
> 
> We don't usually have a LICENSE file directly in pkg packages, since they're
> usually published via tools/publish_pkg.py.

mmm... we seem to be doing this also for polymer, observe, template_binding and
other related packages.

I thought that the publish_pkg.py was mainly used before to ensure you couldn't
publish from bleeding_edge and automatically assign versions, but that we were
going to stop using it now. I personally prefer if we can simply just call
pub-lish from a package directory. One less thing to remember :).