stplanr 1.0.0

• Remove dependency on sp, rgeos and rgdal (#332)
• That involved removal of the following functions:
  • catchmentArea.R
  • Some of the functionality from linefuns.R
  • Browse the code base as of stplanr 0.8.5 here: https://github.com/ropensci/stplanr/blob/v0.8.5
• Removal of 'ABS' reading functionality in favour of https://github.com/mattcowgill/readabs