Treat .cu files as .cpp

lib/linguist/languages.yml

@@ -105,14 +105,15 @@ C++:
   aliases:
   - cpp
   extensions:
-  - .cpp
-  - .hh
+  - .c++
   - .cc
+  - .cpp
+  - .cu
+  - .cxx
   - .h++
+  - .hh
   - .hpp
   - .hxx
-  - .c++
-  - .cxx
   - .tcc
 
 C-ObjDump:

lib/linguist/mimes.yml

@@ -42,10 +42,11 @@ application/x-chrome-extension @crx
 application/x-ms-xbap @xbap :8bit
 application/x-shockwave-flash @swf
 application/x-silverlight-app @xap
+application/x-supercollider @sc :8bit
 application/x-troff-ms :8bit
 application/x-wais-source :8bit
 application/xaml+xml @xaml :8bit
-application/supercollider @sc :8bit
 image/x-icns @icns
 text/cache-manifest @manifest
+text/plain @cu,cxx
 text/x-nimrod @nim