Merge branch 'hotfix_442' into develop
updated docs
updated AUTHORS
hadut.run_pipes does not complain about nonexistent glob-like paths anymore
Bugfix: don't attach a .py extension to a .pyc file
changed hadoop version parser to support older CDH3 version strings
fixed CDH version parsing
added recursive HDFS tree traversal
added recursive HDFS tree traversal to top-level ls/lsl functions
Make hadut.run_cmd and related fns throw a more informative exception

The previous mechanism doesn't provide a way to see the command's return
code.  This commit should be backwards compatible but add the additional
information.
Merge pull request #2 from ilveroluca/hadut_informative_exception

Make hadut.run_cmd and related fns throw a more informative exception
native libraries are now properly loaded; closes #42
updated dev_tools/import_src
added src for cdh4.3
built patches for cdh4.3
updated patch for cdh4.3 (fixed env problem)
fixed blocksize problem
fixed tests; clear cache hdfs before testing it
updated hdfs example for cdh4.3
fixed c++ example for cdh