Fix links in CONTRIBUTING.md file.

CONTRIBUTING.md

@@ -2,8 +2,9 @@
 
 Before submitting a style for inclusion in the style repository, make sure that
 your (modified) style
-[[validates|https://github.com/citation-style-language/styles/wiki/Validation]]
-and meets all our [[style requirements]].
+[validates](https://github.com/citation-style-language/styles/wiki/Validation)
+and meets all our [style
+requirements](https://github.com/citation-style-language/styles/wiki/Style-Requirements).
 
 There are three ways to submit styles. When you want to submit corrections or
 improvements to an existing style, please create a pull request using either the
@@ -12,7 +13,9 @@ have difficulty figuring out options A and B, you can create a gist instead
 (option C). When submitting a new style, use option C or, preferably, B.
 
 We use an automated system for quality control of the style repository (for
-details, see [[Test-Environment]]). After each commit, the [Travis
+details, see
+[Test-Environment](https://github.com/citation-style-language/styles/wiki/Test-Environment)).
+After each commit, the [Travis
 CI](http://travis-ci.org/#!/citation-style-language/styles) service checks all
 the styles in the repository. Checks include validation against the CSL schema,
 but also cover additional requirements specific to our style repository (such as
@@ -49,21 +52,21 @@ See also https://github.com/blog/844-forking-with-the-edit-button
 
 ## (B) Use a git Client
 
-Start by [[forking|http://help.github.com/fork-a-repo/]] the [[style
-repository|https://github.com/citation-style-language/styles]]. Commit your
-changes, and create a [[pull
-request|http://help.github.com/send-pull-requests/]]. You can use your git
-client of choice, such as [[GitHub for Mac|http://mac.github.com/]], [[GitHub
-for Windows|http://windows.github.com/]], or
-[[SmartGit|http://www.syntevo.com/smartgit/index.html]].
+Start by [forking](http://help.github.com/fork-a-repo/) the [style
+repository](https://github.com/citation-style-language/styles). Commit your
+changes, and create a [pull
+request](http://help.github.com/send-pull-requests/). You can use your git
+client of choice, such as [GitHub for Mac](http://mac.github.com/), [GitHub for
+Windows](http://windows.github.com/), or
+[SmartGit](http://www.syntevo.com/smartgit/index.html).
 
 ## (C) Create a 'gist'
 
 Visit http://gist.github.com, and paste the style code into the text box. Give
 the style a name ("name this file...") and click the "Create Public Gist"
 button. Copy the URL of the gist (e.g. https://gist.github.com/1320111), and
 include it in your message to us. You can either start a new discussion in the
-[[Citation Styles section of the Zotero forums|http://forums.zotero.org/11/]],
-or [[create a new GitHub
-issue|https://github.com/citation-style-language/styles/issues/new]] in the
+[Citation Styles section of the Zotero forums](http://forums.zotero.org/11/), or
+[create a new GitHub
+issue](https://github.com/citation-style-language/styles/issues/new) in the
 _styles_ repository.