[heycam/webidl] Specify open dictionaries. (#180)

Let me know what you think. Preview at https://rawgit.com/jyasskin/webidl/open-dictionaries/index.html.

I tried to position `dictionary<K, V>` as a dictionary type, but we may need to move some things from https://rawgit.com/jyasskin/webidl/open-dictionaries/index.html#idl-dictionaries to https://rawgit.com/jyasskin/webidl/open-dictionaries/index.html#idl-dictionary to really make that work. 

I introduced a ["mappings"](https://rawgit.com/jyasskin/webidl/open-dictionaries/index.html#dictionary-mappings) term for the contents of an open dictionary, but I might be able to re-use "dictionary members".

I used `<div algorithm>` blocks to get better `<var>` checking, but that also results in boxes around the algorithms, which you might or might not like.

@bzbarsky @tobie @annevk
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/180

-- Commit Summary --

  * Specify open dictionaries.

-- File Changes --

    M Makefile (2)
    M index.bs (111)
    M index.html (12107)

-- Patch Links --

https://github.com/heycam/webidl/pull/180.patch
https://github.com/heycam/webidl/pull/180.diff

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