Merge pull request #79 from mattyb149/PDI-11463-5.0

PDI-11463: Add cdh50 shim with SNAPSHOT artifacts
PDI-11306: Initial mapr31 shim
[PDI-11036]: FileSystem.isDirectory() is deprecated.  Use isDir().  Fixes two failing test cases.  Fixed packaging path in several places.  Added mapr31 to build list. Updated mapr31 jars.
Merge pull request #77 from pentaho-skarmali/PDI-11306_mapr31_5

[PDI-11306] MapR 3.1 Shim Support
[PDI-11463][SP-1210]: Use CDH 5.0 GA dependencies for cdh50 shim