Pending by #308

Changes:

• Improve readability of CMake output messages (#272)
• Fix const-correctness of member functions (#277)
• Add all-inclusive header and namespace headers (#278)
• Add name manager for efficient name look-up and unique naming (#277)
• Add DegreeOfFreedom class (#288)
• Add hybrid dynamics (#298)
• Add joint actuator types (#298)
• Add Coulomb joint friction (#301)
• Migrate to C++11 (#268, #299)

Target Gazebo version is 5.0 (release date: 2015-01-26)

Feature freeze: Jan 16, 2015
Code freeze: Jan 18, 2015

Supported machines (compilers)

• Ubuntu 14.04 LTS or greater
  • Require GCC 4.8 or greater
• Windows
  • Require Visual Studio 2013 or greater
  • (create additional repo that includes all the dependencies together)
• Mac OS X
  • Require Clang 3.3 or greater