Converted README.md to README.Rmd

To make the readme, just type in:
make readme

from the command line.
Updated README
Removed duplicated aliases in roxygen documentation
Minor updates of roxygen documentation
Merge pull request #6 from ropensci/README_fix

Thanks
Merge roxygen updates
Removed unused file

* wordcloud.png: Removed

* .Rbuildignore: Updated
This is the new broken branch
Changed permissions to 755
Updated ignore list.
Updated docs.
Added @include tags so collate order matches current setup.
Adding new summary fns.

check does not pass still but can install locally.
Updated NAMESPACE and DESC.
Added plyr (ddply) to imports

Should remove fairly soon.
Adding more imports missed the first time around
Updated namespace.
Updated README with new examples.
Quick update to README.
Fixing figs