Resolve issues from libz blitz crate evaluation

[brson]

From https://public.etherpad-mozilla.org/p/rust-api-guidelines-error-chain and https://internals.rust-lang.org/t/crate-evaluation-for-2017-06-27-error-chain/5362

• Rename ErrorChainIter to Iter
• Implement Debug for ErrorChainIter
• Redesign syntax as a proc macro
• Add example for Backtrace::frames
• Replace try! with ? in examples
• Add missing hyperlinks in doc prose
• Add 'readme' and 'keywords' to Cargo.toml
• Remove 'homepage' from Cargo.toml
• Add html_root_url attribute
• Add CHANGELOG.md
• Make ErrorChainIter's field private
• Encapsulate BacktraceFrame
• Add no_std support
• Rename display to display_chain
• Remove ChainedError trait
• Make ErrorKind enum open
• Unify links and foreign_links
• Remove impl Deref for ErrorKind
• Hide error_chain_processed macro
• Rename and hide quick_error macro
• Fix 'example_generated' link
• Redundant error messages due to cause chaining and foreign links
• Bloat due to Msg variant
• Make example_generated agree with the big example in the crate docs
• Rewrite internal quick_error to be more precise

[kennytm]

All links are 404, the URLs should use /issues/ not /issue/.

[brson]

Fixed links. Thanks @kennytm

[Yamakaky]

I created the 1.0 milestone, everything should be in it.

[ahmedcharles]

Probably should update the top post with check marks for the ones that are complete.

[joepie91]

Attaching the contents of the Etherpad (in both HTML and Etherpad format) for posterity, due to the EOL of Mozilla's Etherpad instance.

rust-api-guidelines-error-chain.zip