Merge pull request #5 from MikeHeiber/development

Update for v4.0-beta.1

Author: MikeHeiber

.gitmodules

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+[submodule "tinyxml2"]
+	path = tinyxml2
+	url = https://github.com/leethomason/tinyxml2
+[submodule "googletest"]
+	path = googletest
+	url = https://github.com/google/googletest

.travis.yml

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+# Copyright (c) 2014-2018 Michael C. Heiber
+# This source file is part of the Ising_OPV project, which is subject to the MIT License.
+# For more information, see the LICENSE file that accompanies this software.
+# The Ising_OPV project can be found on Github at https://github.com/MikeHeiber/Ising_OPV
+# Travis CI continuous integration build script
+
+language: cpp
+os: linux
+dist: trusty
+sudo: required
+
+compiler:
+    - gcc
+    
+env:
+    - OPTIONS="GCC_VERSION=5 && MPI=openmpi && TARGET=test_coverage"
+    - OPTIONS="GCC_VERSION=4.7 && MPI=mpich2 && TARGET=test"
+    - OPTIONS="GCC_VERSION=4.7 && MPI=openmpi && TARGET=test"
+    - OPTIONS="GCC_VERSION=4.8 && MPI=mpich2 && TARGET=test"
+    - OPTIONS="GCC_VERSION=4.8 && MPI=openmpi && TARGET=test"
+    - OPTIONS="GCC_VERSION=4.9 && MPI=mpich2 && TARGET=test"
+    - OPTIONS="GCC_VERSION=4.9 && MPI=openmpi && TARGET=test"
+    - OPTIONS="GCC_VERSION=5 && MPI=mpich2 && TARGET=test"
+    - OPTIONS="GCC_VERSION=5 && MPI=openmpi && TARGET=test"
+    - OPTIONS="GCC_VERSION=6 && MPI=mpich2 && TARGET=test"
+    - OPTIONS="GCC_VERSION=6 && MPI=openmpi && TARGET=test"
+    - OPTIONS="GCC_VERSION=7 && MPI=mpich2 && TARGET=test"
+    - OPTIONS="GCC_VERSION=7 && MPI=openmpi && TARGET=test"
+    - OPTIONS="GCC_VERSION=8 && MPI=mpich2 && TARGET=test"
+    - OPTIONS="GCC_VERSION=8 && MPI=openmpi && TARGET=test"
+         
+before_install:
+    - eval "${OPTIONS}"
+    - sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y
+    - sudo apt-get update -qq
+    - sudo apt-get install -qq gcc-$GCC_VERSION g++-$GCC_VERSION -y
+    - sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-$GCC_VERSION 60 --slave /usr/bin/g++ g++ /usr/bin/g++-$GCC_VERSION
+    - sudo update-alternatives --config gcc
+    - gcc --version
+    - if [[ "$MPI" = mpich2 ]]; then sudo apt-get -y install -qq mpich2 libmpich2-dev; fi
+    - if [[ "$MPI" = openmpi ]]; then sudo apt-get -y install -qq openmpi-bin libopenmpi-dev; fi
+    - if [[ "$TARGET" = test_coverage ]]; then pip install --user cpp-coveralls; fi
+    
+script:
+    - make -j10 $TARGET
+    - cd test
+    - travis_wait ./Ising_OPV_tests.exe
+    - cd ..
+    - if [[ "$TARGET" = test_coverage ]]; then coveralls --include src --exclude "googletest/*" --gcov-options '\-lp'; fi
+    - if [[ "$TARGET" = test ]]; then make -j10 && mpiexec -n 4 ./Ising_OPV.exe parameters_default.txt; fi

CODEOWNERS

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+# Define code owners for all files in the repo
+*     @MikeHeiber