Travis: Fixed git version info output

(cherry picked from commit 03917c79cdecb906912d9a94ac5ccdaecc8f62e1)

.travis.yml

@@ -16,6 +16,7 @@ before_install:
   - sudo apt-get -qq install libssl-dev libmysqlclient-dev libmysql++-dev libreadline6-dev zlib1g-dev libbz2-dev libzmq3-dev
   - sudo apt-get -qq install libboost1.55-dev libboost-thread1.55-dev libboost-filesystem1.55-dev libboost-system1.55-dev libboost-program-options1.55-dev libboost-iostreams1.55-dev
   - export CC=clang-3.5 CXX=clang++-3.5
+  - git tag -a -m "Travis build" init
 
 install:
   - mysql -uroot -e 'create database test_mysql;'

cmake/genrev.cmake

@@ -24,7 +24,7 @@ else()
   if(GIT_EXECUTABLE)
     # Create a revision-string that we can use
     execute_process(
-      COMMAND "${GIT_EXECUTABLE}" describe --match init --dirty=+ --abbrev=12
+      COMMAND "${GIT_EXECUTABLE}" describe --long --match init --dirty=+ --abbrev=12
       WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}"
       OUTPUT_VARIABLE rev_info
       OUTPUT_STRIP_TRAILING_WHITESPACE