Minor fixes to handle updates to OS X version 10.10, CMake Version 3.1 and Boost version 1.57.
Added CMake option to include test targets.
Further updates to exclude tests if required.
Another update in preparation for CMake 3.1.
Merge pull request #170 from Fraser999/MAID-457

Minor fixes to handle updates to OS X version 10.10, CMake Version 3.1 a...
Merge pull request #171 from Fraser999/MAID-460

Added CMake option to include test targets.
Updated CMake if statements in line with CMake v3.1 policy.
Bugfix in add_gtests CMake module.
Merge pull request #173 from Fraser999/MAID-500

Updated CMake if statements in line with CMake v3.1 policy.
Merge branch 'next' of github.com:maidsafe/MaidSafe into next
Cmake 3.0 fix

Moved add_subdirectory to after if statement
Merge pull request #174 from rossmuir/MAID-511_Cmake_3_fix

Cmake 3.0 fix
Merge branch 'next' of github.com:maidsafe/MaidSafe into next
updated submodules
Merge branch 'next' of github.com:peersafe/PeerSafe into next