Merge pull request #234 in G/fastr from...

Merge pull request #234 in G/fastr from ~ADAM.WELC_ORACLE.COM/fastr:feature/builtins_sprint to master

* commit 'd81ca916':
  Removed eclipse warnings.
  Rewritten conversion builtins to avoid copy on identity conversion.
  Pairlist copy should involve copying attributes the same as copy method for all other data structures.
  Regenerated tests.
  Rewritten as.raw builtin to use cast pipelines.
  Rewritten as.complex builtin to use cast pipelines.
  Rewritten as.logical builtin to use cast pipelines.
  Rewritten as.double builtin to use cast pipelines.
  Rewritten as.integer builtin to use cast pipelines.
  Minor changes to as.character builtin.
  Extended cast builder to handle complex and raw vector casts.