Updated version of Scala and SBT, plus other minor cleanups.
Adds one possible realization of a SLAB (Standoff Layered Annotated Blob). Slightly extended from my previous proposal so that SLAB can be parameterized by content type (allowing SLAB[String,...], SLAB[Image,...], etc.).
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.
Adds input type parameter to SentenceSegmenter and Tokenizer. Otherwise, older annotations are not passed on to the end of the pipeline.
Merge pull request #20 from bethard/master

Adds input type parameter to SentenceSegmenter and Tokenizer
Didn't need this first cut of actor system.
#18 progress: added StringAnalysisFunction and StringAnalysisComponent to simplify the type signature for common cases.
Renames StringAnnotation to Span, and moves `in` method out of Span so that Span isn't tied exclusively to Strings. The `in` method is now available via an implicit value class, so the overhead of using `in` should not change at all.
Adds a type alias `StringSlab[...] = Slab[String, Span, ...]`. Note that this needs to be a type alias, not a trait, otherwise the Slab type parameters will have to get even more complicated to ensure that a StringSlab subclass of Slab always returns StringSlabs from all the methods that currently return Slabs.
Merge pull request #21 from bethard/master

Renames StringAnnotation to Span, adds StringSlab alias
Adds first pieces of MascSlab and one MASC document to test it with.
Adds an annotation for the MASC source URL
Adds support for reading sentences from MASC -s.xml files
Adds support for reading segments from MASC -seg.xml files
Adds support for reading part-of-speech tags from MASC -penn.xml files