Update README.md

add missing packages to bionic to allow mex build

fix bug related to Contents.m file

Fix bug in constructing path to mesh files

trying to get it to save common and spatial-math

put underscores in long filename of mltbx file

remove version from PDF filename

Test MLTBX build, comment out the unit test

rename output file as RTB.mltbx

don't exclude the lib folder!
reinstate the unit tests

Merge pull request petercorke#71 from jhavl/ets-additions

Added support for modified DH parameters to ETS conversion

suppress display of variables

fix base transform, evaluate numerically to 0s and 1s, rather than later symbolically