fix bug for tweet gen
add profiler for vertica workflow
seperate out the hive create table statment
Added few more Spark tuning parameters.
TODO: modify spark-env.sh
Memory tuning parameters
Added a flag indicating whether to optimize for memory usage for graph algorithm.
Should be set for large data size and small memory.
Currently active only for standalone twitter rank.
optimize memory flag brought to use in bagel implementation
Merge branch 'master' of https://github.com/bigframeteam/BigFrame
modify vertica loader
rebase f674cbdfab38d1e4dad32abf383a003aa942e8e5