Merge pull request #69 from alabid/master

Updated DOCS (made minor fixes) for mongo-hadoop
some refactoring of recordwriter to better handle multiple concurrent writers
fix s3 script to work from any location.
add test for directory-based bson output
Merge branch 'master' of https://github.com/mongodb/mongo-hadoop
fix bootstrap script to exclude S3_bucket and use mapred.output.dir instead of mapred.output.file
use mapred.output.dir for bson output instead of .file in tests.
completely deprecate .file, since reducertasks that use instances of fileoutputformat won't allow both .file and .dir, which is really stupid since it calls a static method on FileOutputFormat which easily could have been an instance method.