[GitHub] orc issue #243: Update the site with more information about developing.

[omalley]

Github user omalley commented on the issue:

    https://github.com/apache/orc/pull/243
  
    I moved the committer list to a new page, because it made all of the other 
information get lost below the long list.
    
    I added sections on how to set up git, approve pull requests, create a gpg 
key, and the dist directory.
    
    I also added Xiening Dai and Gang Wu as committers.


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