Minor fix about the website source

[ghost]

• upgrade json to 1.8.2 for Ruby2.2 compat
• use the recommended way to customize a Struct
• use proper quote for space
• fix rspec

[ghost]

Explanations:

• json issue: incompatibility with Ruby 2.2.0
• ruby-doc Struct#new says Subclassing an anonymous struct creates an extra anonymous class that will never be used.
• I think match["\s"] is a typo, you mean match['\s'], right? Otherwise I perfer match[' '] over match["\s"].
• ./example_runner ./source shows the rspec example has been broken., may dup #110

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Notes:

• I didnot run middleman build to rebuild the static website files.
• This PR should make the CI work since it just modify the website source code(, and all test passed when running ./example_runner ./source). But it failed becasue some incompatible gem upgraded(like fluxmock 1.9.x -> 2.0.x, etc). Should I fix this in another PR or just let it go?

[kschiess]

awesomeness. I'll try to merge this soon!

[kschiess]

Thanks a lot!