Split travis file into helper scripts. Added OSX build.

* Setup and helper script per build target, currently: docs, linux & osx.

scripts/travis/docs_compile.sh

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+#!/bin/sh
+#cd docs/ && make html

scripts/travis/docs_setup.sh

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+#!//bin/sh
+sudo pip install --upgrade pip setuptools
+sudo pip install Sphinx sphinx-rtd-theme

scripts/travis/linux_compile.sh

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+#!/bin/sh
+. /opt/qt56/bin/qt56-env.sh 
+mkdir build && cd build && cmake -DCMAKE_BUILD_TYPE=Debug .. && make

scripts/travis/linux_setup.sh

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+#!/bin/sh
+sudo add-apt-repository -y 'ppa:ubuntu-toolchain-r/test'
+sudo add-apt-repository -y 'ppa:beineri/opt-qt562-trusty'
+sudo add-apt-repository -y 'deb http://apt.llvm.org/precise/ llvm-toolchain-precise-3.8 main'
+wget -O - http://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
+sudo apt-get update -qq 
+sudo apt-get install --allow-unauthenticated -y -qq libx11-dev mesa-common-dev libgl1-mesa-dev qt56base qt56x11extras libxcb-keysyms1-dev gdb clang-format-3.8
+clang-format-3.8 -i -style=file $(find pdblocate/ qrenderdoc/ renderdoc/ renderdoccmd/ renderdocshim/ -type f -regex '.*\(/3rdparty/\|/official/\|resource.h\).*' -prune -o -regex '.*\.\(c\|cpp\|h\)$' -print)

scripts/travis/osx_compile.sh

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+#!/bin/sh
+mkdir build && cd build && cmake -DCMAKE_BUILD_TYPE=Debug .. && make

scripts/travis/osx_setup.sh

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+#!/bin/sh
+brew install qt5
+brew link qt5 --force