Add travis config

This adds a travis config to build everyting on 12.04. Because 12.04 is quite old, there are a certain number of hoops that need to be jumped through in order to get things working. As a result, the build script is more complex than I'd like.

Builds/QtCreator/build_all.sh

@@ -3,6 +3,8 @@
 REBUILD=''
 NVIDIA=''
 NATIVE=''
+CONCURRENCY='-j9'
+QMAKE=${QMAKE:-qmake}
 
 while test $# -gt 0
 do
@@ -13,6 +15,8 @@ do
             ;;
         --native) NATIVE="CONFIG += native"
             ;;
+        --travis) CONCURRENCY="-j1"
+            ;;
         --*) echo "bad option $1"; exit 1
             ;;
         *) echo "unrecognised argument $1"; exit 1
@@ -29,8 +33,8 @@ do
   if [ "x1" = "x$REBUILD" ]; then
     make clean
   fi
-  qmake "$NVIDIA" "$NATIVE"
-  make -j9
+  $QMAKE "$NVIDIA" "$NATIVE"
+  make $CONCURRENCY
   if [ "x$?" != "x0" ]; then
     echo "Build failed! Check output for errors."
     exit 1