added codecov badge; added travis osx builds

.travis.yml

@@ -20,4 +20,7 @@ matrix:
      r: release
    - os: linux
      r: devel
-
+   - os: osx
+     r: release
+   - os: osx
+     r: devel

README.md

@@ -1,10 +1,13 @@
 # rucrdtw - R Bindings for the UCR Suite
 [![Travis-CI Build Status](https://travis-ci.org/pboesu/rucrdtw.svg?branch=master)](https://travis-ci.org/pboesu/rucrdtw)
+[![codecov](https://codecov.io/gh/pboesu/rucrdtw/branch/master/graph/badge.svg)](https://codecov.io/gh/pboesu/rucrdtw)
+
 
 ## License
-COPYRIGHT 2016: Philipp Boersch-Supan (R Bindings)
 COPYRIGHT 2012: Thanawin Rakthanmanon, Bilson Campana, Abdullah Mueen, Gustavo Batista and Eamonn Keogh. (UCR Suite source code)
 
+COPYRIGHT 2016: Philipp Boersch-Supan (R bindings)
+
 Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
 
 http://www.apache.org/licenses/LICENSE-2.0