Added link to the npm package of oauth-signature

oauth-singature-js now supports the browser and node as well, updated the description.
Update index.php
Update index.php

removed python-oauth2 - it is only an, unfortunately-named, oauth 1.0a provider. See description at "https://pypi.python.org/pypi/oauth2/1.5.211". See corroborating comment about oauth2 at http://www.django-rest-framework.org
Merge pull request #68 from chmarr/master

Update index.php
Merge pull request #67 from bettiolo/patch-1

Added link to the npm package of oauth-signature
Update docs and pages from conversation at IIW 2014
remove duplicate line
minor changes and cleanup
add "Covert Redirect" advisory
update pingback/webmention endpoints
add link to section 4.1.5
minor wording changes to advisory
Updating MPOAuth link

MPOAuth moved from Google Code to GitHub.
Added .net client lib
Merge pull request #69 from kylehayes/patch-1

Updating MPOAuth link
Merge pull request #70 from DavidDeSloovere/patch-1

Added .net client lib
Correct Apache Amber to Apache Oltu

Apache Amber was renamed to Apache Oltu in December 2012 [1]. Correct
the names and links under OAuth 2.0 implementations.

[1]: https://mail-archives.apache.org/mod_mbox/incubator-amber-dev/201212.mbox/%3CCAAqLGLPwSEmcqPMsYk_wiCUtVbD9oZeQdFoAuL2HG5uf3f=Csw@mail.gmail.com%3E
Merge pull request #72 from charlessimpson/apache-amber-oltu

Correct Apache Amber to Apache Oltu
Update link to Ruby Oauth library
Merge pull request #73 from jcamenisch/patch-1

Update link to Ruby Oauth library