Changed title of the navigation window

Signed-off-by: Sébastien Boisvert <sebastien.boisvert.3@ulaval.ca>
update path position upon selection

Signed-off-by: Sébastien Boisvert <sebastien.boisvert.3@ulaval.ca>
changed JSON information returned

The information returned for vertices is now an Array instead of
a Object.

Signed-off-by: Sébastien Boisvert <sebastien.boisvert.3@ulaval.ca>
the user can now change the minim coverage

Signed-off-by: Sébastien Boisvert <sebastien.boisvert.3@ulaval.ca>