Add plural _INCLUDE_DIRS _LIBRARIES variables to find cmake. Add gitignore file

.gitignore

+bin
+build
+lib

Findtrajectory.cmake

@@ -3,7 +3,10 @@ FIND_PATH(trajectory_INCLUDE_DIR trajectory.h /usr/include/iri/trajectory /usr/l
 
 FIND_LIBRARY(trajectory_LIBRARY
     NAMES trajectory
-    PATHS /usr/lib/iri/trajectory /usr/local/lib /usr/local/lib/iri/trajectory) 
+    PATHS /usr/lib/iri/trajectory /usr/local/lib /usr/local/lib/iri/trajectory)
+
+SET(trajectory_INCLUDE_DIRS ${trajectory_INCLUDE_DIR})
+SET(trajectory_LIBRARIES    ${trajectory_LIBRARY})
 
 IF (trajectory_INCLUDE_DIR AND trajectory_LIBRARY)
    SET(trajectory_FOUND TRUE)