Merge pull request #2 from aaron0browne/issue-1

Correct DATEDIFF translation to PostgreSQL
Fixed previous commit
Ported from C++ to Java for simultaneous deployment in Node servers.
Committing deletes
Added cast to real for LN function in Redshift ('numeric' type not supported on compute nodes).
Added JavaDoc
Now using JRE6 for maximum compatibility.
Merging replacement strings into a single file
Initial ant build file
Cleaner git
Fixing R build on Travis
Rename test file
Need binary install of rJava on Travis
More attempts with Travis
Added rJava import into NAMESPACE
ant build using JDK6
More ignored files
Rebuild jar with latest replacementPatterns.csv
Removed VARCHAR(MAX) replacement rule for Redshift
Moved csv file back to csv folder. JAR rebuild no longer needed when changing replacement patterns (Except when you want to use the jar outside of the R package)