First implementation for multi-threaded of samoa on local machine
1. The number of threads used in the main Engine is specified in samoa-local.properties
2. ParallelMasterProcessingItem creates multiple ParallelWorkerProcessingItem and pass ContentEvents to the worker
3. The workers are allocated to the threads (in the pool) in a way that a worker (and its processor) will be allocated to only one thread during the whole
process to ensure linearizability in the context of 1 Processor
Clean up some code
Some unit tests for Master, Worker PIs and ProcessingTask
Changes in run script (bin/samoa) to read from properties/options file
Use PriorityBlockingQueue for thread pool to preserve some order among execution of different processor and notify entrance processor (now only PrequentialSourceProcessor) when thread queue size is large
Merge branch 'master' of https://github.com/yahoo/samoa
Added examples to repository
Cleanup code for examples. Fixes #59
Merge pull request #60 from gdfm/example

Add examples to the repository
Streamlined comments
Merge pull request #61 from gdfm/example

Streamlined comments and removed unused code
Change name of Topology,ITopology, delete ISummitter
Change name of Topology
Merge with master
Merge with master
Clean up after merge and changes in api
Add LocalEntranceProcessingItem (common superclass of SimpleEntranceProcessingItem and ThreadsEntranceProcessingItem)