Remove broken Travis support

This never worked.  Remove it to avoid giving the impression that it is
supposed to work.

.travis.yml

@@ -1,14 +0,0 @@
-language: cpp
-
-compiler:
-- gcc
-#- clang
-
-before_install:
-- sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y
-- sudo apt-get update -qq
-- sudo apt-get install -y libphysfs-dev libsdl1.2-dev libsdl-mixer1.2-dev
-- if [ "$CXX" = "g++" ]; then sudo apt-get install -qq g++-4.8; fi
-- if [ "$CXX" = "g++" ]; then export CXX="g++-4.8" CC="gcc-4.8"; fi
-
-script: scons