Merge pull request #1 from hotosm/gh-pages

Updating my fork so same as original
Merge remote-tracking branch 'upstream/gh-pages' into gh-pages
Added section concerning IRC messages, plus additional grammar & punctuation corrections highlighted by other users.
Reducing image sizes to 520px longest side each
Merge pull request #236 from Nick-Tallguy/gh-pages

IRC section added & small grammar & punctuation amendments