Merge pull request #30 from francois-keith/master

Add the methods linked to the research of openhrp installation.
Remove useless cmake message.
Log PROJECT_SOURCE_DIR and PROJECT_BINARY_DIR.
Fix inclusion of python.cmake file

  Using PROJECT_SOURCE_DIR instead of CMAKE_SOURCE_DIR as the root of the cmake
  directory is more robust.
Added new inclusions in PYTHON_INSTALL and PYTHON_INSTALL_BUILD macro
      Replaced CMAKE_SOURCE_DIR to PROJECT_SOURCE_DIR;
               CMAKE_BINARY_DIR to PROJECT_BIN_DIR
Remove cmake warnings due to messages.

Warning observed with cmake 2.8.12.1
Merge pull request #31 from nemogiftsun/master

catkin_make compatibilty
Delete cache variables relative to C and CXX compilers in distcheck target

  distcheck target copies CmakeCache.txt file and removed two entries.
  With package using catkin, the distcheck target failed since for some reason
  cmake did not source again cmake files checking for C and CXX compilers.

  As a result, CMAKE_LIBRARY_ARCHITECTURE variable is not set and find_package
  macro of roscpp fails to locate libpthread.so because it does not look in
  /usr/lib/i386-linux-gnu (for Ubunutu 12.04 32bits).

  Deleting cache variables relative to the compiler force distcheck target to
  source again the appropriate cmake files.
Merge pull request #32 from florent-lamiraux/master

Delete cache variables relative to C and CXX compilers in distcheck target
Allows to specify the minimal boost version required.