Lots to update

-cleaned up most of ChromosomeView
-changed ChromosomeView's data retrieval from one-time-load to
load-as-needed via REST
-reorganized icons file paths
-modified view animations by using exponential functions to model
zooming
-added the new Eplant namespace which contains functions and variables
specific to ePlant
-centered SVGs to rid the need to manually adjust positional offset
values
-made icons change "state" according to the availability of views for
the active species/gene
-InteractionView is now accessible through its icon after a gene is
selected
-returning to SpeciesView will have the active species selected as a
reminder to the user