Should fix issue #49
Enumerating setup/run instructions for installation test scripts
Putting lesson URLs in configuration and taking advantage thereof.

1.  Add `lesson_repo` and `lesson_site` variables to `_config.yml`.
2.  Refer to variables in `_includes/footer.html` to link to bug reports.
3.  Modified `index.html` accordingly.
Explaining the edits needed to _config.yml
Corrects link for workshop create script
Merge pull request #92 from gvwilson/adding-website-url

Adding website url to configuration
Merge pull request #94 from willingc/fix-doc-link

Corrects link for workshop create script
LICENSE.md: Bump the CC BY 3.0 to 4.0

Titles from the v4 release notes [1]:

* A more global license
* Rights outside the scope of copyright
* Common-sense attribution
* Enabling more anonymity, when desired
* 30-day window to correct license violations
* Increased readability
* Clarity about adaptations

[1]: https://creativecommons.org/version4
Add note about chmod

Address issue reported by @willingc.
Telling users what country names are accepted
Merge pull request #96 from r-gaia-cs/cc-by-4

Upgrade to CC BY 4.0
Merge pull request #103 from gvwilson/clarifying-country-names

Telling users what country names are accepted
Merge pull request #99 from r-gaia-cs/add-chmod-note

Add note about chmod to instructions for workshop template script executable
Merge branch 'gh-pages' of github.com:swcarpentry/workshop-template into gh-pages
Refactoring the checking tool
More refactoring to handle text from the web
check.py: fixed PEP8, global errors list

PEP8 changes:
* two lines before function definition
* shortened too long lines (except for one regexp)

Switched to logging:
* now a list of errors for each category is shared between functions

Removed global list of errors:
* instead functions pass a reference to the list that's held in `main()`
* two new formatting helpers: `add_error(msg, errors)` and
  `add_suberror(msg, errors)` -- if you want to know details how they
  work, take a look at their docstrings
Merge pull request #84 from brainstorm/gh-pages

Redirects for people with top level github.io domains. Fixes issue #49
Merge pull request #89 from gvwilson/editing-setup-check-instructions

Enumerating setup/run instructions for installation test scripts
Merge branch 'gh-pages' into refactoring-check