pages: index: README, panel headings in <h2>
pages: index: panel-default
pages: Installation => Quick Install
pages: panel headings in <h3>
Gruntfile: 'watch' also does 'assemble'
Merge pull request #10 from eins78/themestrap-backports

pages: fixes
rebuild index.html when README.md changes

Now that we have the contents of `README.md` in `index.html`, we need it watched as well.
Merge pull request #11 from trumbitta/patch-1

rebuild index.html when README.md changes
trim trailing space
Add proper class for Divshot link in navbar

It's better to have it, because dark themes could make the link disappear.
Port some details of kitchen sink to BS3

* `btn-large` to `btn-lg` in jumbotron
* add `navbar-default` to first navbar example
examples/kitchen-sink: fix .input-large => .input-lg; add .input-sm