add Travis-CI integration

Travis-CI [1] is a continous integration cloud service. It is free for
open-source projects and tigthly integrated tiwh GitHub so there is really
no reason for us not use it. :)

For now we are going to do a total of 4 builds, mainly to test ffmpeg/libav
API breakage:

 * ffmpeg-stable, libass-stable
 * ffmpeg-git, libass-stable
 * libav-stable, libass-stable
 * libav-git, libass-stable

The compiler that is currently used is clang for two reasons:

 * running 8 build targets would be quite wasteful and take a long time
 * clang is less tested and used during development than gcc (especially on
   linux)

Currently Travis doesn't support OS X environments alongside Linux ones [2].
When it will, we will add a fifth build target to test OS X compilation
breakage.

README was moved to markdown to add the little build status image. I ran some
tests with my GitHub fork and couldn't get images to show up using ReStructured
Text.

 [1]: https://github.com/travis-ci/travis-ci
 [2]: travis-ci/travis-ci#216

1 files changed, 29 insertions, 0 deletions

diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000000..cd5a9d4262
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,29 @@
+language: c
+
+env:
+  - LIBAV=libav-stable
+  - LIBAV=libav-git
+  - LIBAV=ffmpeg-stable
+  - LIBAV=ffmpeg-git
+compiler:
+  - clang
+branches:
+  only:
+    - master
+
+before_install: ./travis-deps libass-stable $LIBAV
+script: ./configure && make
+
+notifications:
+  email:
+    recipients:
+      - mpv-team@googlegroups.com
+    email:
+      on_success: change
+      n_failure: always
+  irc:
+    channels:
+      - "irc.freenode.org#mpv-player-dev"
+    email:
+      on_success: change
+      n_failure: always