Matrix by vector enqueuing
Merge branch 'master' of ssh1.it-sudparis.eu:~granger/dev/liblooklike

some merge
removed redundant test : should be in static Matrix::mul()
more comments
removed unused functions
modified code for matrix vecotr support, corrected missing dependency checking (which is not important since out of order queues are not supported yet)
added support for matrix vector (kernel + test)
trying to sum up the first part of the acp process
full pca, wip
working test computation of main eigen vector with img2eig
minor corrections
transition from MathExpression to Algorithm
new revision of Algorithm, this class is angostic to OpenCL. Everything is broken
Algorithm behaves as expected : first example is working
modified examples directory structure, updated CMakeFiles and source files accordingly
Saving and loading of an armadillo matrix
level2 exemple is working
brought back support for OpenCL, example3 demonstrate the use, it is much simpler now
matrix compile, somme arguments messed up, matrix_test fails
small error corrected, but stange behaviour, first values are correct