fix plotlyviz colors; fix agglomerative clustering; change searchbar default

2.0.1

Fixed

• min_cluster_samples now only accepts an int -- now AgglomerativeClustering works (#224)
• plotlyviz.scomplex_to_graph no longer casts color_values to a 2d array, and visuals._tooltip_components now generates
  either 1d or 2d member_histogram depending on dimensionality of color_values (#225)

Fixed/Changed

• The AND and OR searchbar queries no longer multiplies the base size of a node by the ratio of how many of its items match. Rather,
  the base size of the node is simply multiplied by how many of its items match the query. With this change, the size of a node
  during an AND or OR search query again directly reflects the number of items within the node. (#227)
• The default search mode is now AND -- because that's the expected behavior, because that's how the google works (#227)