Support Markdown links with multiple spaces or tabs in front
FIX: Support for IMG URLs with parentheses in them.
Support references that span lines
FIX: Allow link references following a list
FIX: Allow reference definitions with quotes
Merge pull request #135 from eviltrout/list_references

FIX: Allow link references following a list
Merge pull request #136 from eviltrout/ref_quotes

FIX: Allow reference definitions with quotes
Merge pull request #134 from eviltrout/ref_spaces

Support references that span lines
Merge pull request #131 from eviltrout/img_parens

FIX: Support for IMG URLs with parentheses in them.
Merge pull request #127 from eviltrout/link_spaces

Support Markdown links with multiple spaces in front
Remove .npmignore.

We specify the files to include to npm in package.json, so this isn't needed.
src/markdown.js: fix typo in comment.
Rename *.markdown docs to *.md.
Update README.md.

Fix release link and remove empty lines from lists.
Update Changes.md.

* link to the issues and to the authors
* sort issues by number
* a few other minor improvements