Updated instructions for turtle 4.
Merge pull request #156 from nanan9177/tutorial

Updated instructions for turtle 4.
Reduce use of read pool until we can ensure it doesn't try to write to it.
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Up the default number of production unicorn procs
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Change blockly root to go based off document host instead of asset_host.
Add new ajax loaded hero unit
Change css to better fit user menu into pegasus
Try to add headers to allow x domain.
Change css to better fit user menu into pegasus
Add headers to correct directive (location).
Revert "Change blockly root to go based off document host instead of asset_host."

This reverts commit fe119fd9d56e1ac48a6b6d12b041ace02a46cd29.
Use "sign in" button, instead of sign in/up text.

Also hide "sign in" on all sign in/up, account pages
Try to come up with styles that work on both code.org and learn.code.org css
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Log request time in nginx access logs
Fix arabic config
Add line to GA config to allow cookie sharing with code.org