Create .travis.yml

Initial Travis Continuous Integration support, using the Ubuntu 14.04 Trusty Tahr environment.

.travis.yml

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+sudo: required
+dist: trusty
+
+language: cpp
+
+compiler:
+  - gcc
+
+os:
+  - linux
+
+branches:
+  only:
+  - master
+
+notifications:
+  email: false
+  irc:
+    channels:
+    - "chat.freenode.net#rawtherapee"
+    template:
+    - "%{repository}/%{branch} (%{commit} - %{author}): %{build_url}: %{message}"
+
+env:
+  global:
+  - OMP_NUM_THREADS=4
+
+before_install:
+  - sudo apt-get -qq update
+  - sudo apt-get install build-essential cmake curl git libbz2-dev libcanberra-gtk-dev libexiv2-dev libexpat-dev libfftw3-dev libglibmm-2.4-dev libgtk2.0-dev libgtkmm-2.4-dev libiptcdata0-dev libjpeg8-dev liblcms2-dev libpng12-dev libsigc++-2.0-dev libtiff5-dev zlib1g-dev
+
+before_script:
+  - mkdir build
+  - cd build
+  - cmake -DCMAKE_CXX_FLAGS="-std=c++11" -DWITH_LTO="OFF" -DPROC_TARGET_NUMBER="2"
+
+script: make