Merge pull request #112 from rappleg/master

Update Codenarc from 0.18.1 to 0.19
Changed sponsors.
Merge branch 'master' of github.com:GroovyMN/gum-website
Added Dan Woods - Ratpack talk to archived section.
Added Dan Woods - Ratpack talk to archived section.
adding intellij as a community sponsor
Merge pull request #114 from GroovyMN/intellij

adding intellij as a community sponsor
Added Dan Woods - Ratpack talk to archived section.
Added Dan Woods - Ratpack talk to archived section.
Added oreilly sponsorship.
Updated slides link for Ratpack talk.
Removing Ubuntu PPA link, Colin mentioned it's no longer maintained.
Increase height of twitter widget to span both rows of sponsors