created sampling Package / Added SampleByKey UDF
Merge branch 'master' of https://github.com/linkedin/datafu
 Removed redundant test
Merge branch 'master' of https://github.com/linkedin/datafu
 Changed random double generate algorithm/ Added reservoir sample
Merge pull request #35 from evionkim/master

Created package sampling/ Added SampleByKey UDF
Remove comments in pig script
Merge pull request #39 from matthayes/master

Support for embedding multiline Pig scripts in Java test files
Cleanup tests

Moved pig code in Java files for stats and urls.

Also removed ApplyQuantiles since can compute more easily through Enumerate and dividing by size.
More test cleanup
Rename datafu.pig.numbers to datafu.pig.random
Cleanup tests