Make markdown.js work with IE8

IE8's Array.prototype.splice requires 2nd argument to specify the
number of elements to be removed. Without that, nothing is removed.

If JS compressor (e.g., yui) compresses markdown.js,

  ... function Markdown(dialect) {

will become something like:

  ... function g(d) { ...

Then, Markdown.dialects.Gruber becomes g.dialects.Gruber.
But IE8 does not understand this. The fix is just remove
"Markdown" from after "function".
Add test for attributes on a code block (Maruku dialect)
Improve usage examples and commands in README
Fix error with link references in blockquotes
Merge pull request #68 from tatsuhiro-t/master

Make markdown.js work with IE8
Tests for line endings
Issue #58 FIXED

Normalize EOL to `\n` so markdown doesn't gag on it.
Handle Windows (and other) line endings
fix a few JSHint warnings