[GitHub] orc issue #166: ORC-91: Use hdfs v-blocks instead of zero-padding stripes

[omalley]

Github user omalley commented on the issue:

    https://github.com/apache/orc/pull/166
  
    Changes:
    * Renamed HadoopShims_2_2 to HadoopShimsPre2_3 and moved to shims module.
    * Removed TextReaderShim since we aren't using it any more.
    * Pulled the padding method into the HadoopShim as padStreamToBlock.
    * Added HadoopShimsPre2_7.
    * Refactored a bit so that the shim classes share most of the code, while 
making sure that older shims never reference new shims.
    * Fixed some broken javadoc.


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