moving up branch target
Update build_linux.sh

By supplying code to the Revolution Analytics team, I agree to assign copyright of that code to Revolution Analytics Inc., on the condition that it releases that code under the Apache 2.0 license.

updated link to ant
better mr graphics from David
rename in memory combine and some indentation
knitrified
needs paren for the knitr snippet to work
integrated @khharut changes

with minor changes
workaround for catools bug #73
Merge pull request #74 from khharut/patch-4

Update build_linux.sh
incorporated new benchmarks for data frame split and serde
simplify and better naming
deal with the empty data frame
useless line
typo
dealing with NULL values more gracefully
merge from master with multiple bug fixes and changes in docs