rvertnet v0.5.0

NEW FEATURES

• searchbyterm() gains new parameter query to allow full text search,
  much like vertsearch(), but with the ability to also use all the parameters
  available in searchbyterm() (#53)

MINOR IMPROVEMENTS

• Use dplyr::bind_rows instead of the deprecated dplyr::rbind_all (#51)
• remove personal email address from tests (#52)
• Namespace base R pkg fxn calls (methods/stats/utils), and removed
  some package dependencies that we didn't really need (plyr) (#54)