Automatically update the Web Starter Kit latest release download URL

Grunt 'build' will trigger the 'wsk-version' task, which in turn uses
['latest-release'](https://www.npmjs.org/package/latest-release) to
determine the name, tag and zip-archive download URL of the latest
release of google/web-starter-kit on Github.

The results of this are written to src/site/_config-wsk-version.yml.

Jekyll.destination.config has been expanded to pick this config yml up
load in the variables when building the site.

src/site/_en/starter-kit/index.html uses the {{site.wsk-zip-url}}
variable to point it's download button the to latest version.

See discussion in:
- google/web-starter-kit#414
- google/WebFundamentals#547
Bumps Web Starter Kit to v0.5.1

Commits the generated output of `grunt wsk-version`.
Fixing hebrew wording and style

After the changes Ian made to the RTL.
fixing the wording
corrected some translation of constructing-the-object-model.markdown
Merge pull request #904 from agektmr/discovery_and_distribution

Revised articles for Discovery and Distribution section
Update sass for other RTL bullet cases
Adds theme color meta (based on section) to the head
Merge pull request #905 from google/ido-he-fixes

More fixes to the hebrew version
Fix indentation in _en/starter-kit/index.html

Two spaces should be used to indent HTML code, instead of tabs. [1]

[1]: https://google-styleguide.googlecode.com/svn/trunk/htmlcssguide.xml#Indentation
Tentatively fix issue #854

The images have their path hardcoded, which means they are broken
in the development site served by grunt (which has no web folder).
fix typo
add images-in-markup.markdown to _zh-cn
translate images-in-markup.markdown into Chinese
Merge pull request #908 from chenxsan/fix-typo

fix typo
Merge pull request #907 from jacquerie/issue-854

Issue 854
Merge pull request #909 from chenxsan/media

translate images-in-markup.markdown into Chinese
Fixing up the styleguide.html references
Merge branch 'master' of github.com:google/WebFundamentals

* 'master' of github.com:google/WebFundamentals: (24 commits)
  translate images-in-markup.markdown into Chinese
  add images-in-markup.markdown to _zh-cn
  fix typo
  Tentatively fix issue #854
  Fix indentation in _en/starter-kit/index.html
  Adds theme color meta (based on section) to the head
  Update sass for other RTL bullet cases
  fixed date
  Revised articles for Discovery and Distribution section
  translate media/images/index.markdown into Chinese
  add media/images/index.markdown to _zh-cn
  Update list styles to support rtl
  fixing the wording
  Fixing hebrew wording and style
  Delete old scripts
  Add RTL support for different languages
  Corrected invalid CSS
  fix typos in constructing-the-object-mode.markdown
  fix typos in constructing-the-object-model.markdown
  add a hunmin's profile image
  ...
update translate