Improve check for in-source build.
Updated Boost to version 1.57.0.
Merge remote-tracking branch 'origin/next' into MAID-203
Fixed to handle source paths containing regex special chars.
Merge remote-tracking branch 'origin/next' into MAID-203

Conflicts:
	CMakeLists.txt
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 remote-tracking branch 'origin/next' into MAID-432_boost_1_57

Conflicts:
	cmake_modules/add_boost.cmake
Merge remote-tracking branch 'upstream/next' into MAID-432_boost_1_57
Merge pull request #169 from Fraser999/MAID-432_boost_1_57

Updated Boost to version 1.57.0.
Merge pull request #146 from Fraser999/MAID-203

MAID-203: Improve check for in-source build.