rename, refine and link to new contributing doc from several places.

CONTRIBUTING.rst

@@ -15,14 +15,14 @@ Submit feedback for developers
 Do you like py.test?  Share some love on Twitter or in your blog posts!
 
 We'd also like to hear about your propositions and suggestions.  Feel free to
-submit them as issues `here <https://bitbucket.org/hpk42/pytest/issues>`__ and:
+`submit them as issues <https://bitbucket.org/hpk42/pytest/issues>`__ and:
 
 * Set the "kind" to "enhancement" or "proposal" so that we can quickly find
   about them.
 * Explain in detail how they should work.
 * Keep the scope as narrow as possible.  This will make it easier to implement.
-* If you have required skills and/or knowledge, you can always contribute to
+* If you have required skills and/or knowledge, we are very happy for
-  these issues!
+  pull requests (see below).
 
 Report bugs
 -----------

doc/en/_templates/links.html

@@ -1,6 +1,7 @@
 <h3>Useful Links</h3>
 <ul>
   <li><a href="{{ pathto('index') }}">The pytest Website</a></li>
+  <li><a href="{{ pathto('contributing') }}">Contribution Guide</a></li>
   <li><a href="https://pypi.python.org/pypi/pytest">pytest @ PyPI</a></li>
   <li><a href="https://bitbucket.org/hpk42/pytest/">pytest @ Bitbucket</a></li>
   <li><a href="https://github.com/hpk42/pytest/">pytest @ github</a></li>

doc/en/contact.txt

@@ -18,6 +18,9 @@ Contact channels
 
 - `pytest-commit at python.org (mailing list)`_: for commits and new issues
 
+- :doc:`contribution guide <contributing>` for help on submitting pull
+  requests to bitbucket or github.
+
 - #pylib on irc.freenode.net IRC channel for random questions.
 
 - private mail to Holger.Krekel at gmail com if you want to communicate sensitive issues

doc/en/contents.txt

@@ -16,7 +16,7 @@ Full pytest documentation
    plugins
    example/index
    talks
-   contribute
+   contributing
    funcarg_compare.txt
    announce/index
 

doc/en/develop.txt

@@ -1,40 +0,0 @@
-=================================================
-Feedback and contribute to pytest
-=================================================
-
-.. toctree::
-   :maxdepth: 2
-
-   contact.txt
-
-.. _checkout:
-
-Working from version control or a tarball
-=================================================
-
-To follow development or start experiments, checkout the
-complete code and documentation source with mercurial_::
-
-    hg clone https://bitbucket.org/hpk42/pytest/
-
-You can also go to the python package index and
-download and unpack a TAR file::
-
-    http://pypi.python.org/pypi/pytest/
-
-Activating a checkout with setuptools
---------------------------------------------
-
-With a working Distribute_ or setuptools_ installation you can type::
-
-    python setup.py develop
-
-in order to work inline with the tools and the lib of your checkout.
-
-If this command complains that it could not find the required version
-of "py" then you need to use the development pypi repository::
-
-    python setup.py develop -i http://pypi.testrun.org
-
-
-.. include:: links.inc