UTIL: Changed file system functions
MVE: Removed unused EXIF parser function
MATH: added multi-variate gaussian, moved various functions to new functions.h
TESTS: moved gaussian and fastpow tests to gtest_functions.cc
MATH: Added math::matrix_multiply and math::matrix_transpose for dynamic matrices
Merge pull request #83 from lemony-fresh/statistical

MATH: added multi-variate gaussian, moved various functions to new funct...
MVE: Re-added mve::Bundle::delete_camera() feature
math: fix declarations regarding matrix diagonals
Merge pull request #84 from Waldteufel/matrix-diagonal-rename

math: fix declarations regarding matrix diagonals
OGL: add check_gl_error function
OGL: add error checking to ShaderProgram
OGL: reset shader id on unload
OGL: track linking status of shader program

(GL_LINK_STATUS means something different)
OGL: either load all shader parts or none
UMVE: use util::fs api to get home dir
UMVE: fix shader load order
Merge pull request #85 from Waldteufel/umve-fix-shader-reload

Fix shader reload
DOCS: Enable search bar in Doxyfile
Merge pull request #86 from kdex/doxygen-search

DOCS: Enable search bar in Doxyfile
UMVE: make example plugin compatible with Qt5
Merge pull request #87 from Waldteufel/qt5-plugins

UMVE: make example plugin compatible with Qt5