CRAN version

Major change

• remove sp argument from osrmRoute()
• returnClass default is now "sf" where it was previously "sp"
• The next major version of osrm will drop support for sp objects

Minor changes

• Better handling of request with curl_fetch_memory()
• Better (lower) default value for demo server
• Update demo in README with complete maptiles + mapsf + osrm example
• Update sf dataset (update crs)
• Replace old RData sample dataset by new dataset in raw files