I created a Makefile.optimus that has to be linked inside the src
both *.c files were altered in order to fit my laptop's GPU
Moved commands around for better readability

For the sake of readability, the 0-ing of host variables was
clustered with the corresponding reduction "for" loop.
Hiding my personal makefile from you

Added an extra line at the .gitignore file in order to hide my
Makefile.optimus file.
Merge branch 'master' into data_transfer

just synching my branch to the upstream -> origin -> master