Merge branch 'hotfix_442'
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
Merge branch 'cdh4_3_support' into develop
version bump
Merge branch 'develop'
added travis file
modified .travis.yml
added ssh trick to .travis.yml
back to inline if statement in travis yml
mod to travis yml