Always use https for W3C stylesheets and logo

See discussion at https://github.com/darobin/respec/commit/48a748ccb1caaa7d4ba42286e94ccb433e921d52
Update test
Merge pull request #242 from lanthaler/always-https

Always use https for W3C stylesheets and logo
v3.1.60
Merge branch 'release/v3.1.60' into develop
Updated RDFa processing so that RDFa 1.1 is generated
by default.    Ensured that the output is consistent
with microformats too.  Incorporated the w3p vocabulary
for w3c process stages.  Added tests about what is
generated and what is not depending on doRDFa settings.
Updated documentation.  Expanded generation of output
documents to include XHTML1 and XHTML5.  XHTML1 generation
remains valid by removing aria stuff as well as HTML5 stuff.
Rolled up modified files.

Now supports RDFa as a default.

Can be disabled with doRDFa = false.

Documentation updated.
fixed merge conflict
Adjusted some tests to disable RDFa
Adding instructions on how to run the test suite to the README file.
Merge pull request #244 from tobie/improve-readme

Adding instructions on how to run the test suite to the README file.
Merge remote branch 'upstream/develop' into develop
Fixed some issues Tobie identified.
integrated rdfa tests into phantom-runner
Merge pull request #243 from halindrome/develop

Support for RDFa
v3.1.61
Merge branch 'release/v3.1.61' into develop
Document build process
Moved all WAI-ARIA @aria-level and @role handling to its own
module.

Updated tests to ensure aria stuff is injected correctly.
Commited a comment to force a remerge and test.