add basic config for travis build system

Author: q4a

.gitignore

@@ -1,13 +1,16 @@
-# exclude all dot files except .git files
+# exclude all dot files except .git, appveyor and travis files
 .*
 !.git*
+!.appveyor*
+!.travis.yml
 
 # exclude binaries and temporary files
 bin/
 bin_plugs/
 intermediate/
 intermediate_plugs/
 lib/
+src/Externals/
 *.aps
 *.user
 *.PVS-Studio.*

.travis.yml

@@ -0,0 +1,29 @@
+language: cpp
+cache: ccache
+sudo: required
+dist: trusty
+compiler:
+- g++
+install: export CXX="g++-7"
+os:
+- linux
+before_script:
+  - g++ --version
+  - sudo apt-get install libegl1-mesa-dev libgles2-mesa-dev libpugixml-dev libopenal-dev libtbb-dev libcrypto++-dev
+  - sudo apt-get install cmake lua5.1-dev libssl-dev libogg-dev libtheora-dev libvorbis-dev libsdl2-dev liblzo2-dev libjpeg-dev libncurses5-dev
+  - mkdir bin
+  - cd bin
+  - cmake ..
+script:
+- if [ $TRAVIS_OS_NAME == linux ]; then make && file src/xrCore/xrCore.so; fi
+addons:
+  apt:
+    sources:
+    - ubuntu-toolchain-r-test
+    packages:
+    - g++-7
+notifications:
+  email: false
+env:
+  global:
+  - LANG="en_US.UTF-8"