Generalized Source node painting
Added Source able to receive String and convert to emitted type
Added Emitter resiliance to receivers' failures

Now Emitter ignores thrown exceptions from Receivers (prints stack
trace)
Added OpenSourceEmitter
Implemented more descriptive statistics reduce functions

- Open
- Close
- Range
- Median
- Percentile
- Mode
Improved JMX support

Registering only OpenSource sources
Improved building DSL design
Removed obsolete sbt build
Fixed duplicate reduce function names
Added Slider & Joiner
Added lifecycle support
Migrated to Akka actors
Added grizzled-slf4j dependency
Added dummy test akka.conf
Fixed PeriodCollector spec
Changed version number to 0.3
Changed version number to 0.4-SNAPSHOT
Condition added
Improved Source Java API
Small buildfile fix
Formatted Datum scaladocs
Added sbt build