Fixed a bug with na-handling
Merge pull request #62 from mmarsman1/development

Fixed a bug with na-handling
Added librt.so into linking for linux
Update R location on linux
Fixes/hacks around linux issues
Added support for tab separated .csv files
Fix to properly escape JSON with single quotes

This issue was introduced with the commit
e915bb3876e523c302f8c769c46a7b502b737a89
Removed linux dependence on libRcpp.so
In Rcpp 0.11 it is no longer necessary to link against this, in fact you can't.
Crosstabs: Added a 'counts' option
Updates to documentation

* Newer R bundles
* Added linux R bundle
* Added rebasing your repo guide