Add asan/tsan tests

.travis.yml

 language: cpp
 before_install:
   - sudo add-apt-repository ppa:yjwong/gflags -y
+  - sudo add-apt-repository ppa:h-rayflood/llvm -y
   - sudo apt-get update -qq
-  - sudo apt-get install -qq libgtest-dev libgflags-dev python-virtualenv
+  - sudo apt-get install -qq libgtest-dev libgflags-dev python-virtualenv clang-3.5
 env:
   global:
     - RUBY_VERSION=2.1
   matrix:
     - CONFIG=dbg TEST=c
     - CONFIG=dbg TEST=c++
+    - CONFIG=asan TEST=c
+    - CONFIG=asan TEST=c++
+    - CONFIG=tsan TEST=c
+    - CONFIG=tsan TEST=c++
     - CONFIG=opt TEST=c
     - CONFIG=opt TEST=c++
     - CONFIG=opt TEST=node
@@ -16,6 +21,6 @@ env:
 script:
   - rvm use $RUBY_VERSION
   - gem install bundler
-  - ./tools/run_tests/run_tests.py -l $TEST -t -j 16 -c $CONFIG -s 2.0
+  - ./tools/run_tests/run_tests.py -l $TEST -t -j 16 -c $CONFIG -s 4.0
 notifications:
   email: false
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