Set the codepage to 65001 before generating
Add check for running on Windows
chcp only needs to run once
Add note about current stable version of Octopress to README.

Fixes #1451.
Merge pull request #1431 from Haacked/windows-code-page-fix

Set the codepage to 65001 before generating
Ignore protocol relative '//' urls.
Removed accidental call to expand_url
Fixed the expand_url filter. Finally.

Thanks @larryprice
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