If the index.html header contains a blank line, check.py returns an error
indicating "superfluous categories". This message was unclear about the cause
of the error. This change reports the presence of blank lines in the header
specifically as an error.

Fix favicon link

Fix shortcut icon link to one that works (alternatively, the site template should be updated so that v5/favicon.ico goes somewhere)

Merge branch 'gvwilson-refactoring-check' of github.com:pbanaszkiewicz/workshop-template into refactoring-check

Enumerating setup/run instructions for installation test scripts

Redirects for people with top level github.io domains. Fixes issue #49

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

Add note about chmod to instructions for workshop template script executable

Telling users what country names are accepted

Upgrade to CC BY 4.0

Address issue reported by @willingc.

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

Corrects link for workshop create script

Adding website url to configuration

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.

Renaming the workshop creation script for upload to Software Carpentry website.

This PR renames `tools/create` to `tools/swc-workshop-create` so that when we upload it to http://files.software-carpentry.org, and people download it from there, its purpose will be clearer --- `create` on its own isn't particularly meaningful.

This PR also does some minor copy-editing on messages inside the script.

Fixing internal link references.

Integrate the installation-test with the main page

Fixing broken links in standard footer.

Update README.md

1.  Added and corrected variables in `_config.yml`.
2.  Fixed references in `_includes/footer.html`.