Add .travis.yml for Travis CI (for Github user...)

4 jobs
* autotools / gcc
* autotools / clang
* cmake / gcc
* cmake / clang

Change-Id: Ifc5b079415232b77680c87b2dee441566e08c835
Reviewed-on: https://code.wireshark.org/review/3944
Reviewed-by: Evan Huus <eapache@gmail.com>
Reviewed-by: Alexis La Goutte <alexis.lagoutte@gmail.com>

.travis.yml

@@ -0,0 +1,20 @@
+language: cpp
+compiler:
+  - clang
+  - gcc
+env:
+ - BUILD_CMAKE=no
+ - BUILD_CMAKE=yes
+before_install:
+  - $CC --version
+  - sudo add-apt-repository --yes ppa:ubuntu-toolchain-r/test
+  - sudo apt-get update -qq
+    #libstdc++-4.8 is needed by Clang to build
+  - sudo apt-get -qq install  libstdc++-4.8-dev
+  - sudo apt-get build-dep wireshark
+  - sudo apt-get install cmake libgtk-3-0 libglib2.0-0 libgdk-pixbuf2.0-0 libcairo2 libqt4-dev
+  - $CC --version
+before_script:
+  if [ ${BUILD_CMAKE} == "yes" ]; then mkdir build && cd build && cmake ..; else ./autogen.sh && ./configure --with-gtk2; fi
+script:
+  - make