Added a link to John's original blog about the shiv. Removed an implication that John intended the name shiv to represent a weapon. Added an implication that other developers did. Moved a reference to etymology. Added offensive and derogatory remarks about Microsoft Internet Explorer.
I prefixed the protocol relative links (using `https:` where applicable) since they were not being recognized by GitHub Flavored Markdown - see [issue 98](https://github.com/github/github-flavored-markdown/issues/98). Added a backslash to escape the closing parenthesis to the link to "Shim_(computing)" at Wikipedia.