vector: improve documentation
headers: disable GLU in GLEW
tests: update amirite
performance: rethrow exceptions properly
tests: update amirite
tests: add angle tests
vector: use size_t as index type
image: initial implementation
test: add rgba tests
iterator/accessible: change how it infers the needed information
Merge remote-tracking branch 'taye/column-major' into master

Conflicts:
	include/gloglotto/matrix
	include/gloglotto/matrix.tpp
	tests/matrix.cpp