nvctr 0.1.3
- removed 
knitcitations, now missing from CRAN 
- fixed spelling typos
 
nvctr 0.1.3
- added cross-track functions
 
nvctr 0.1.2
- added some utility functions in order to show some examples of
application of the package in the aviation sector
 
- some improvements in the documentation
 
nvctr 0.1.1