Update studio.code.org with hoc2014 blocks, course4, and other improvements.
Update studio.code.org with four blocks for hoc2014, course4 block, new course1-4 info about age range, and lighten blocks to match studio bar on code.org.
More improvements to studio.code.org and nearby pages.
Hide Frozen from updated studio.code.org for now.
Merge branch 'staging' into studioupdates
Merge pull request #595 from code-dot-org/studioupdates

studio.code.org updates for hoc2014