Migrated the testing tutorial from .markdown to .md format.
Added edge badge
Ensure edge badge is shown on all pages
Relevant side menu now opens when a section meta tag is supplied in a guide
Add section to rest of guides
Link fixes
Fix up advanced topics section
Fixed typo iscalculated -> is calculated
More Broken Link fixes
Some various fixes
Fix link_to
Added requesting and configuring ssl guide
Eliminating WARN, INFO, and NOTE
Converted the security tutorial to the .md format
Merge branch 'new_guides' of github.com:spree/spree-guides into new_guides
Fix Broken link to SSL Guide
Merge branch 'new_guides' of github.com:spree/spree-guides into new_guides