making the continuous navigation action server an input to the monitored navigation
getting preemption to work properly
code cleaning
added monitored navigation gui
removed scitos_2d_nav of monitored_nav.launch
Merge pull request #18 from BFALacerda/hydro-devel

adding service calls for asking for human help
Merge branch 'hydro-devel' of https://github.com/strands-project/strands_navigation into hydro-devel