Added new folder and random selection algorithm
 Added randomize seed parameter. Added readme
Update readme
added building files
files for compiling engine
reading data file in scala, DataSource added
moved random rec engine under examples, update readme markdown
added engine files
update directory structure
Datasource file moved to example/scala-local-friend-recommendation folder
file_stream command line arguments added, readme updated
Keyword similarity method added.\nWarning: not tested because LAlgorithm cannot be resolved.
datasource added to random engine
readme updated
add subset of data so that we can test random algorithm
change name and org in build.sbt
Change KeywordSimilarity method to be lazy, only getting confidence when needed. Tested
Add an engine.json for keyword similarity, change training data file name to be unified, add a factory for keyword similarity.
DataSource added
DataSource return mutable HashMap, need to change to immutable