Merge branch 'release-0.2.0' into develop
0.3.0 develop SNAPSHOT version
minor updates to notes for herald
Merge branch 'hotfix-0.2.1'
Merge branch 'hotfix-0.2.2'
README example usage update
README usage update
README dataset conversion update
chart factories accept implicit chart theme parameter
purges the internal dependencies on JFreeCharts ChartFactory

- in doing so reduces some overhead
- allows more direct control over these internals
start notes for the next release
Add encodeAsPNG
Add overloaded encodeAsPNG with more options
Small documentation fixes
rm unused arguments, restructuring StorableChart

- alpha encoding and compression level are actually unused
  by JFreeChart (see source code of the encoders package)
- restructuring StorableChart in three sections
  - encoding,
  - writing and
  - saving
update release notes with chart encoding
restructuring StorableChart into separate traits
provide encodeAsJPEG functionality
provide JPEG and PNG writers
using our own writers for saving charts, using String rather than File for output file name