Fixed issue #16.  Path limit increased.
removed common_rosdeps from all manifest dependencies.

Should fix issue #17.
Removed common_rosdeps from stack.xml.
Second part of fix for issue #17.
Added two regression tests for navfn: one failing, one passing.
Failing test tests for situation from issue #18.
Fixed issue #18.
When oscillation is detected during gradient following, calcPath() falls back on simple grid following.
Merge branch 'groovy-devel' of github.com:vecnatechnologies/navigation into groovy-devel