Seqpeekv2 integration

Sample number threshold for switching the SeqPeek view to bar plots is configured in atlas.json (option "bar_plot_threshold" under "mutations_combo" view).
Bar plots have hovercards that display variant type and statistics.
Bar plots are colored using the same schema as lollipop plots.
Added  hovercards to coding regions that display information from the InterPro data source.
SeqPeek dependency is updated in Bower configuration.