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

• [x] Rename ErrorChainIter to Iter
• [x] Implement Debug for ErrorChainIter
• [ ] Redesign syntax as a proc macro
• [ ] Add example for Backtrace::frames
• [x] Replace try! with ? in examples
• [x] Add missing hyperlinks in doc prose
• [x] Add 'readme' and 'keywords' to Cargo.toml
• [x] Remove 'homepage' from Cargo.toml
• [x] Add html_root_url attribute
• [x] Add CHANGELOG.md
• [x] Make ErrorChainIter's field private
• [ ] Encapsulate BacktraceFrame
• [ ] Add no_std support
• [x] 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
• [x] 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