misc(package): bump version numbers for 0.2.0 release

merge branch 'enhance/r-3-1', support R 3.1, re #40

Merge pull request #33 from nteetor/assign-anything

Assign parts of objects

small changes before CRAN submission

final revision before submitting to CRAN

small clarification

edited README, resized logo, added missing fields to DESCRIPTION

fixed broken link in README