edited image URLs to display CWL logo. Conditional carpentry logic still needs to be fixed

Author: Toby Hodges

_includes/lesson_footer.html

@@ -7,7 +7,7 @@
       <h4>
 	Copyright &copy; 2016–{{ 'now' | date: "%Y" }}
 	{% if site.carpentry == "swc" %}
-	<a href="{{ site.swc_site }}">Software Carpentry Foundation</a>
+	<a href="{{ site.cwl_site }}">Common Workflow Language Project</a>
 	{% elsif site.carpentry == "dc" %}
 	<a href="{{ site.dc_site }}">Data Carpentry</a>
 	{% elsif site.carpentry == "lc" %}

_includes/navbar.html

@@ -14,7 +14,7 @@
       {% comment %} Select what logo to display. {% endcomment %}
       {% if site.carpentry == "swc" %}
       <a href="{{ site.swc_site }}" class="pull-left">
-        <img class="navbar-logo" src="{{ page.root }}/assets/img/swc-icon-blue.svg" alt="Software Carpentry logo" />
+        <img class="navbar-logo" src="{{ page.root }}/assets/img/cwl-apple-icon-180x180.png" alt="Common Workflow Language logo" />
       </a>
       {% elsif site.carpentry == "dc" %}
       <a href="{{ site.dc_site }}" class="pull-left">