Travis: Added OSX, use default compilers, moved cmds into own scripts

.travis.yml

@@ -1,14 +1,11 @@
+os:
+  - linux
+  - osx
+
 language: cpp
-compiler:
- - gcc
+
 before_install:
- - sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y
- - sudo apt-get -qq update
- - sudo apt-get -qq install g++-4.8 xorg-dev libglu1-mesa-dev libglew-dev libxcursor-dev
- - sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.8 90
- - git clone https://github.com/glfw/glfw.git
- - "mkdir glfw/build && cd glfw/build && cmake .. && make && sudo make install ; cd -"
+ - sh .travis-deps.sh
+
 script:
- - mkdir build && cd build
- - cmake ..
- - make -j4
+ - sh .travis-build.sh