nvctr 0.1.5

nvctr 0.1.4

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

Submission to CRAN.