contributors logos added to index screen footer
changed hyperlink to funding anchor - added same for the images
old footer removed for index page
removed little underscores appearing between images - caused by link added to images
MAINT remove dead code from LibSVM
FIX : get rid of coef_init in Lasso in dict learning
add about us to community block
Merge pull request #2350 from jaquesgrobler/DOC_inria_google_logos

DOC: contributors logos added to index screen footer