Removed the examples from the man page. Put them back when example dataset are available

Signed-off-by: Charles Joly Beauparlant <Charles.Joly-Beauparlant@crchul.ulaval.ca>
inst/doc/MetaFeatures.Rnw: Added a vignette file

Signed-off-by: Charles Joly Beauparlant <Charles.Joly-Beauparlant@crchul.ulaval.ca>