Changes to make RHIPE work CDH5 RHEL

1. Changed build.xml to use R CMD build (failed on Linux/RHEL)
2. rherrors can read output of rhwatch(..., read=FALSE) to read the errors folder using the new dump frames options
3. rhJobInfo, rhstatus and rhwatch correctly get the jobid (uses the Java MapReduce API)
4. rhstatus (inside FileUtils) to return jobid (no need to use regex parsing)