Delete .travis.yml (#1177)

.travis.yml

-language: c++
-
-matrix:
-  include:
-    - os: linux
-      compiler: gcc
-    - os: osx
-      compiler: clang
-    - os: osx
-      compiler: gcc
-env:
-  - CTEST_OUTPUT_ON_FAILURE=1
-
-before_script:
-  - mkdir build
-  - cd build
-  - cmake ..
-  - cd ..
-script:
-  - cmake --build build
-  - cmake --build build --target test
-
-addons:
-  apt:
-    sources:
-    - ubuntu-toolchain-r-test
-    - llvm-toolchain-precise-3.9
-    packages:
-    - g++-4.9
-    - clang-3.9
-    update: true
-  homebrew:
-    packages:
-    - ccache
-    - gcc@4.9
-    - llvm@4
-    update: true