Fix Git warning

warning: You ran 'git add' with neither '-A (--all)' or '--ignore-removal',
whose behaviour will change in Git 2.0 with respect to paths you removed.
Paths like 'Collage-1.1/CoverageReport/CMake/common/cpp/index-sort-f.html' that are
removed from your working tree are ignored with this version of Git.
Merge pull request #142 from tribal-tec/master

Fix Git warning