Added support for whitespace-delimited input to readtable()
char(nextchr) for julia.in() v0.2.0 compatibility
Added test for quoted whitespace (works)
Index fixes/updates

* Fix rename! from Dictionary
* Make names!, rename!, and delete! to return the updated Index,
  rather than the names in the index
* Added tests for the above
Merge pull request #445 from JuliaStats/kms/index_update

RFC: Index fixes/updates
Merge pull request #443 from davidavdav/master

Added support for whitespace-delimited input to readtable()
Change summary to describe, closes #447
Merge pull request #450 from IainNZ/patch-2

Change summary to describe, closes #447