Release 0.3.5

Changes in Rblpapi version 0.3.5 (2016-10-25)

• Add new function getPortfolio to retrieve portfolio data via bds
  (John in #176)
• Extend getTicks() to (optionally) return non-numeric data as part
  of data.frame or data.table (Dirk in
  #200)
• Similarly extend getMultipleTicks (Dirk in
  #202)
• Correct statement on timestamp for getBars (Closes issue
  #192)
• Minor edits to a few files in order to either please
  R(-devel) CMD check --as-cran, or update documentation