EKF: add travis build

.travis.yml

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+language: cpp
+sudo: required
+compiler: g++
+
+before_install:
+- sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
+- sudo apt-get update -qq
+
+install:
+- sudo apt-get install -qq g++-4.8
+- export CXX="g++-4.8"
+
+before_script:
+ - chmod +x build.sh
+
+script: ./build.sh

build.sh

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+wget -O eigen.tar.bz2 http://bitbucket.org/eigen/eigen/get/3.2.8.tar.bz2
+mkdir eigen
+tar -xvjf eigen.tar.bz2 -C eigen --strip-components=1
+mkdir eigen-build
+cd eigen-build
+cmake ../eigen
+make
+sudo make install
+cd ..
+mkdir Build
+cd Build
+cmake ../EKF
+make