typo 'plain'->'better'?

I'm not sure, but it would make sense if 'plain' is replaced with 'better'.
As it is, I am wondering if listing properties in the 'attributes' attribute results in them being automatically created, but I am left wondering what 'plain' is all about.
Add vulcanized .js files to ignore
Remove tools-private submodule. Fixes #551
Merge branch 'master' of https://github.com/Polymer/docs
Add vulcanize to install steps.
Update styling.md

Define acronyms the first time they are used.
Documented that this.$ only contains static nodes. Fixes #460.

Added mention of using querySelector from a known node
in the shadow to find other nodes.
Fix indentation
Merge pull request #561 from jbdeboer/patch-1

Update styling.md
extra (wrong) quote in name-tag example

The name tag example has a quote (") too many,
which makes the example HTML invalid
Merge pull request #555 from davidmaxwaterman/patch-2

typo 'plain'->'better'?
Merge pull request #563 from frunjik/patch-1

extra (wrong) quote in name-tag example
Corrections for Monostate pattern in #565
Update layout-attrs.md
Fixes #568
Updated to address comments.
Merge branch 'master' of https://github.com/Polymer/docs into docs-460
Moved note up to make it more prominent and rephrased opening paragraph to remove misleading phrase, 'Every node...'. Also escaped mustaches in code example.
docs-468: Doc computed block & inline function support.
Fixes #468 & #427.
Also updates .gitignore, which was ignoring some of our samples.
Clarified intro sentence, made capitalization consistent for shadow DOM.