Merge pull request #17 from bethard/master

Here's one possible realization of a SLAB (Standoff Layered Annotated Blob)
Draft of actor based system for using Slabs.
#18 progress: changed analyzers to be functions so that processing can be done w/ or w/o Actors.
Switched to 1.3-SNAPSHOT so that we are focusing on less granular versions.
#18 progress. Moved non-actor bits out of AnalysisEngine.scala into AnalysisFunction.scala and created example AnalysisPipeline main method for processing w/o Actors.
#18 progress: Added AnalysisEngine, which can process multiple texts asyncronously.