v0.3.0

Added

• Useful imports to top level module.
• Activity indicators to anchors in anchor list table.
• add_anchor function directly to model.
• Saving/loading functionality to anchors, anchor lists, and models.
• Add expand/collapse all anchors in anchor list button.
• Buttons for label all interesting/uninteresting to selected data tab.

Fixed

• Text fields not applying changes when user clicks away instead of hitting enter.
• Similarity function anchor dropdown change not triggering featurization.
• Data manager's active data columns incorrectly updating with anchor names if model
  hasn't been trained yet.