Various docs updates

* "Github" -> "GitHub"
* strict=True only applies to marshmallow 2
* Add note about framework integration in CONTRIBUTING

#287 (comment)

CONTRIBUTING.rst

@@ -13,17 +13,30 @@ In General
 In Particular
 -------------
 
-Questions, Feature Requests, Bug Reports, and Feedback. . .
-+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+Questions, Feature Requests, Bug Reports, and Feedback…
++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 
-. . .should all be reported on the `Github Issue Tracker`_ .
+…should all be reported on the `GitHub Issue Tracker`_ .
 
-.. _`Github Issue Tracker`: https://github.com/sloria/webargs/issues?state=open
+.. _`GitHub Issue Tracker`: https://github.com/sloria/webargs/issues?state=open
+
+
+Integration with a Another Web Framework…
++++++++++++++++++++++++++++++++++++++++++
+
+…should be released as a separate package.
+
+**Pull requests adding support for another framework will not be
+accepted**. In order to keep webargs small and easy to maintain, we are
+not currently adding support for more frameworks. Instead, release your
+framework integration as a separate package and add it to the
+`Ecosystem <https://github.com/sloria/webargs/wiki/Ecosystem>`_ page in
+the `GitHub wiki <https://github.com/sloria/webargs/wiki/Ecosystem>`_ .
 
 Setting Up for Local Development
 ++++++++++++++++++++++++++++++++
 
-1. Fork webargs_ on Github. ::
+1. Fork webargs_ on GitHub. ::
 
     $ git clone https://github.com/sloria/webargs.git
     $ cd webargs

docs/_themes/lucuma/header.html

@@ -17,12 +17,12 @@ <h1 class="logo"><a href="{{ pathto('index') }}" title="{{ t.return_to_home_page
         <a class="nav-item" href="{{ pathto('index') }}">{{ t.nav_home }}</a>
       </li>
       <li class="hidden-xs">
-        <a class="nav-item" href="{{ github }}" title="{{ github }}"><i class="fa fa-github"></i> Github</a>
+        <a class="nav-item" href="{{ github }}" title="{{ github }}"><i class="fa fa-github"></i> GitHub</a>
       </li>
       <li class="toc toc-large">
         <a data-toggle="dropdown" href="#toc" class="nav-item">
           <span class="visible-xs"><i class="fa fa-bars"></i></span>
         </a>
       </li>
     </ul>
-</header>
+</header>

docs/advanced.rst

@@ -70,7 +70,7 @@ When you need more flexibility in defining input schemas, you can pass a marshma
         # ...
 
 .. warning::
-    You should always set ``strict=True`` (either as a ``class Meta`` option or in the Schema's constructor) when passing a schema to webargs. This will ensure that the parser's error handler is invoked when expected.
+    If you're using marshmallow 2, you should always set ``strict=True`` (either as a ``class Meta`` option or in the Schema's constructor) when passing a schema to webargs. This will ensure that the parser's error handler is invoked when expected.
 
 .. warning::
     Any `Schema <marshmallow.Schema>` passed to `use_kwargs <webargs.core.Parser.use_kwargs>` MUST deserialize to a dictionary of data. Keep this in mind when writing `post_load <marshmallow.decorators.post_load>` methods.