Delete .travis.yml

.travis.yml

----
-language: c
-
-before_install:
-  - sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
-  - sudo apt-get update -qq
-install:
-  - sudo apt-get install -qq gcc-avr binutils-avr avr-libc gcc-4.8 g++-4.8 arduino
-  - sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.8 90
-  - sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.8 90
-  - gcc --version
-  - g++ --version
-
-script: "cd Marlin && make HARDWARE_MOTHERBOARD=70 ARDUINO_INSTALL_DIR=/usr/share/arduino"