quickshift: doc fixes (thanks to David Doria)
adds vl_det.m
vl_roc.m: adds NumNegatives option
toolbox: adds VL_CUMMAX()
vl_roc.m and vl_pr.m: rewrites, more standard, less code, better doc
mdoc.py: simplify identifier of MATLAB documentation pages
web.css: better looking links within code sections
web.css: define a new type of list which flows more naturally in text
formatter.py: adds comments
vl_pegasos.c: cosmetic fix
doc: adds tutorial on ROC, DET, and PR curves
host.*: improves documentation
slic: fixes comments
generic.c: adds developer documentation
vl_cummax.m: comments
mexutils.h: refactors a function name and adds string comparison functions
apps/phow_caltech101.m: fixes call to vl_homkermap
vl_kmeans.c: avoids crash when an empty matrix is passed in
vl_test_assert_almost_equal.m: now works recursively on structures
vl_pr.m, vl_roc.m: fixes a bug treating -inf scores