Added Entityx to project

external/entityx-1.1.2/.travis.yml

@@ -0,0 +1,15 @@
+language: cpp
+compiler:
+  - clang
+  - gcc
+before_install:
+  - sudo apt-add-repository -y ppa:jkeiren/ppa
+  - if test $CC = gcc; then sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test; fi
+  - sudo apt-get update -qq
+  - if test $CC = gcc; then sudo apt-get install --yes --force-yes gcc-4.7 g++-4.7; fi
+  - if test $CC = gcc; then sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.7 20; fi
+  - if test $CC = gcc; then sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.7 20; fi
+  - if test $CC = gcc; then sudo update-alternatives --config gcc; fi
+  - if test $CC = gcc; then sudo update-alternatives --config g++; fi
+
+script: ./scripts/travis.sh