Fix syntax in DESCRIPTION.

Remove blank line and add missing closing bracket.
(Without these changes, the package won't install.)
Move data to standard place and format.

Move the data files provided with the package into the `data` subdirectory.
This is required, as documented
[here](http://cran.r-project.org/doc/manuals/r-release/R-exts.html#Data-in-packages).

Also, change the data to the CSV format recognised by `data()`, by using
semicolons as delimiters and removing the column of row numbers.  (See `?data`
for more info.)
Merge pull request #3 from dvukcevic/package_cleanup

Thank you for the fixes, Damjan!
Grammar + examples from Mice

some grammatical changes, and added the use of some datasets from the
`mice` package.
small changes

Packrat removed.

Not sure what git ignore changes are - just some blank lines removed.