Fix clang warnings, add clang to travis

Jan Breuer

2015-10-04 df3eeb1a9be519b5eaef18b8f7c2d7a201bf7b97

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addons:
  apt:
    packages:
    - libcunit1-dev
    - clang
 
sudo: false
 
script:
    - make
    - CC=clang CFLAGS="-g -O0 -fsanitize=address" LDFLAGS="-g -fsanitize=address" make clean test