[Travis] Remove testing on Travis for the moment.

Was not able to fix it. Ended up with mysterious linker errors in VTK.
Tried to reproduce within a similar environment with no succes.
Everywhere else everything is fine...

Testing on Jenkins seems solid, we should focus on that...

.travis.yml

-sudo: required
-dist: trusty
-language: cpp
-
-addons:
-  apt:
-    sources:
-      - ubuntu-toolchain-r-test
-    packages:
-      - g++-4.9
-
-cache:
-  ccache: true
-  directories:
-    - $HOME/cmake-3.1.1-Linux-x86_64
-    - $HOME/.conan
-
-git:
-  lfs_skip_smudge: true
-
-env:
-  global:
-    - CCACHE_SLOPPINESS=pch_defines,time_macros
-    - PATH=$HOME/cmake-3.1.1-Linux-x86_64/bin:$PATH
-matrix:
-  include:
-    - compiler: gcc
-      env: CASE=CLI CMAKE_ARGS="-DOGS_BUILD_UTILS=ON"
-    - compiler: gcc
-      env: CASE=GUI CMAKE_ARGS="-DOGS_BUILD_GUI=ON -DOGS_BUILD_CLI=OFF -DOGS_BUILD_TESTS=OFF -DCMAKE_POSITION_INDEPENDENT_CODE=ON"
-
-before_install:
-  - bash scripts/travis/cmake.sh
-  - bash scripts/travis/conan.sh
-  - git lfs pull --exclude "web/**,Tests/Data/**"
-  - git lfs pull --include "Tests/Data/FileIO/**,Tests/Data/MathLib/**"
-
-script:
-  - mkdir build; cd build
-  - CC=gcc-4.9 CXX=g++-4.9 cmake $CMAKE_ARGS -DOGS_USE_CONAN=ON -DOGS_CONAN_BUILD=never -DOGS_USE_PCH=OFF -DCMAKE_BUILD_TYPE=Release ..
-  - make -j 2
-  - if [ "${CASE}" == "CLI" ]; then make tests; fi

README.md

@@ -4,7 +4,6 @@ OpenGeoSys 6
 [![Tag](https://img.shields.io/github/tag/ufz/ogs.svg?style=flat-square)](https://github.com/ufz/ogs/releases)
 [![BSD License (modified)](http://img.shields.io/badge/license-BSD-blue.svg?style=flat-square)](https://github.com/ufz/ogs/blob/master/LICENSE.txt)
 [![Build Status](https://jenkins.opengeosys.org/buildStatus/icon?job=ufz/ogs/master)](https://jenkins.opengeosys.org/job/ufz/job/ogs/job/master)
-[![Travis](https://img.shields.io/travis/ufz/ogs.svg?style=flat-square)](https://travis-ci.org/ufz/ogs)
 [![DOI](https://zenodo.org/badge/1701384.svg)](https://zenodo.org/badge/latestdoi/1701384)
 
 [OpenGeoSys][ogs] (OGS) is a scientific open source project for the development of

scripts/travis/cmake.sh

-#!/bin/sh
-set -e
-# check to see if cmake folder is empty
-if [ ! -d "$HOME/cmake-3.1.1-Linux-x86_64/bin" ]; then
-    CMAKE_TAR="cmake-3.1.1-Linux-x86_64.tar.gz"
-    cd $HOME
-    curl -L -o $CMAKE_TAR http://www.cmake.org/files/v3.1/$CMAKE_TAR;
-    tar -xzf $CMAKE_TAR;
-else
-    echo 'Using cached cmake directory.';
-fi

scripts/travis/conan.sh

-wget http://downloads.conan.io/latest_debian -O conan.deb
-sudo dpkg -i conan.deb
-rm conan.deb