Configure Travis for OS X build

It cannot build multi-platform right now.

.travis.yml

@@ -1,15 +1,11 @@
-language: c
-os:
-    - linux
-    - osx
-compiler:
-    - clang
-    - gcc
+#set language to objective-c to force osx build
+#linux builds are done at http://buildbot.dev.kryo.se
 
-before_install:
-    - if [ `uname` == "Linux" ]; then sudo apt-get update -qq && sudo apt-get install -qq check zlib1g-dev; fi
-    - if [ `uname` == "Darwin" ]; then brew update && brew install check; fi
+language: objective-c
+os: osx
+
+before_install: brew update
+install: brew install check
 
 script: make && make test
 
-install: true