Bump version 3.1.0 including Herdt's algorithm.

In this minor revision a new algorithm allowing
automatic foot placement and velocity reference
has been tested on a real HRP-2 (namely n10) with
the StackOfTasks
(commit de771bd54c73233cb41bd5031460e9b886b7c26b)

For references see:

Online Walking Motion Generation with
Automatic Foot Step Placement

A. Herdt, D. Holger, P.B. Wieber, D. Dimitrov,
K. Mombaur and D. Moritz

Advanced Robotics

Vol. 24 Issue 5-6, pp. 719--737

CMakeLists.txt

@@ -29,8 +29,8 @@ SET(CMAKE_VERBOSE_MAKEFILE ON)
 # Set version
 #------------
 set(CPACK_PACKAGE_VERSION_MAJOR 3)
-set(CPACK_PACKAGE_VERSION_MINOR 0)
-set(CPACK_PACKAGE_VERSION_PATCH 2)
+set(CPACK_PACKAGE_VERSION_MINOR 1)
+set(CPACK_PACKAGE_VERSION_PATCH 0)
 
 SET(PROJECT_VERSION ${CPACK_PACKAGE_VERSION_MAJOR}.${CPACK_PACKAGE_VERSION_MINOR}.${CPACK_PACKAGE_VERSION_PATCH}.99)