Turn EIPs repository into a Github Pages / Jekyll site

[Arachnid]

This PR restructures the EIPs repository so merged EIPs can be parsed as Jekyll documents, and adds structure and configuration to render it as such. A preview of the generated site can be seen here.

Changes to the already-committed EIPs:

• Add '---' on lines before and after the header data for each EIP, making them valid YAML prologues.
• Change header names to be lower case.
• Standardise names and values in EIPs that did not match conventions described by EIP-1.

In addition, this PR includes a few changes to EIP-1:

• Changing header names to match the changes made to each EIP.
• Incorporating new header entries that were specified in the template but not EIP-1.
• Adding the requirement for '---' either side of header entries.

The template eip-X has also been updated to reflect these changes.

Next steps (after this PR):

• Set up a CNAME for eips.ethereum.org
• Link to the new page from the README, and direct people there for reference and for canonical URLs.
• Add travis build to automatically check PRs for validity.
• Open discussion about changes to the EIP draft/merge/update process.

[Souptacular]

Great stuff!

[jamesray1]

The link to the preview generated site, http://arachnid.github.io/EIPs/, gives a 404. Other than that this looks good!

[Arachnid]

@jamesray1 Should be fixed now, though I'll take it down again once it's up and running on its permanent URL.

[tjayrush]

Excellent. Categorize this as an Ethereum Improvement Proposal that helps everyone better understand what's going on.

[jamesray1]

@Arachnid awesome, the preview looks great!

[jamesray1]

Oh, the link to the template EIP doesn't work.

http://arachnid.github.io/EIPs/

https://github.com/ethereum/EIPs/blob/master/eip-X

[jamesray1]

It needs to have .md on the end of it; this works:
https://github.com/ethereum/EIPs/blob/master/eip-X.md.

[Arachnid]

@jamesray1 Fixed in my outstanding PR, thanks for spotting it.

[jamesray1]

You're welcome Nick!