first commit of circular feature viewer
tested the component in the registry and changed a couple of annotation errors
Added line to mark sequence position
CircularGenomeFeatureViewer

A component that loads circular genomes from the NCBI and displays
annotations over the sequence.
Arrow rotation

First steps towards rotation using arrows
Added rotation key listeners
Ready for submission
Documentation changes
Merge pull request #42 from jmVillaveces/master

CircularFeatureViewer + CircularGenomeFeatureViewer