[travis] Build against triqs master

.travis.yml

@@ -30,9 +30,8 @@ script:
   - cd $TRAVIS_BUILD_DIR
   - source root_install/share/cpp2pyvars.sh
   # ===== Set up TRIQS
-  - git clone https://github.com/TRIQS/triqs --branch unstable
+  - git clone https://github.com/TRIQS/triqs
   - mkdir triqs/build && cd triqs/build
-  - git checkout unstable
   - cmake .. -DCMAKE_CXX_COMPILER=/usr/bin/${CXX} -DBuild_Tests=OFF -DCMAKE_INSTALL_PREFIX=$TRAVIS_BUILD_DIR/root_install -DCMAKE_BUILD_TYPE=Debug
   - make -j8 install
   - cd $TRAVIS_BUILD_DIR