Use relative paths in README

GitHub recently fixed a problem where relative paths in Markdown files
didn't behave as desired.

Fix gh-1296
Update jQuery to version 1.9.1
Recommend version-specific python server commands
Added IE10 tap highlight disable & WebKit→IE10 doc
Fix link to Pull Request help in CONTRIBUTING.md

GitHub changed their help page URLs and did not correctly redirect the
old Pull Request help URL.
Corrected terminology in comment

Really, really nitpicky change here but ... the comment was referring to the selection rule sets as "declarations", which isn't exactly the correct term. See:

http://nimbupani.com/css-vocabulary.html
http://www.impressivewebs.com/css-terms-definitions/
Merge pull request #1313 from impressivewebs/patch-1

Corrected terminology in comment
Fixed typo in `main.css`
Fix 404 widget script URL

Fix 404 widget script URL to be compatible with HTTPS by replacing
`http://` with `//`. The script hosted by Google is available on both
protocols.
Update CHANGELOG
Import latest `.htaccess` configurations

Update the Apache configurations to include the
latest changes in the canonical `.htaccess` file.
Fix Grunt link in docs

The repo has moved from 'cowboy/grunt' to 'gruntjs/grunt'.
Docs: replace `htaccess.md` with link (fix #1344)

Remove `htaccess.md` and link to the Apache `README.md` in
the `server-configs` repository as the documentation for the
configurations is now officially maintained in that repository.
Update normalize.css to v1.1.1
Remove Google Analytics protocol check

Google now serves all Analytics scripts via SSL also so the protocol
check is no longer necessary.

Close #1319
Update CHANGELOG
v4.2.0
Docs: fix broken links
Add documentation for iOS web applications

Add several options to improve iOS web apps with meta tags when
adding a web page to the Home Screen.

Closes #1352.
Update to Normalize.css 1.1.2