Fix  Issue #57.
removed activity1 and activity2
delete autosaved header files
Delete deprecated apps (activity1, activity2) in CMakeLists.txt
Create 'math' namespace and moves 'EigenHelper', 'UtilsMath', and 'UtilsRotation' to 'math' namespace.
Create 'math' namespace and moves 'EigenHelper', 'UtilsMath', and 'UtilsRotation' to 'math' namespace.
Fix build errors from change namespace from utils to math.
Change defines of headers in math namespace.
Merge branch 'origin/master'