STY
ENH Label:  add .color attribute
OPT labels_from_parc():  use Label.color attr
TEST
ENH:  blend Label colors when adding Labels
OPT parc_from_labels()
FIX grow_label():  assign Label subject
DOC:  whats_new
ENH:  add color when splitting labels
STY TEST:  use `assert_equal(x, y)` instead of `assert x == y`
ENH:  add .color attribute to BiHemiLabel
TEST STY:  use `assert_is`
ENH read_label():  add name and color attributes
DOC:  Note that subject and color are not saved
ENH grow_labels():  Assign color to labels (based on plt.cm.spectral)
FIX DOC grow_labels()
ENH stc_to_label():  add colors
Merge pull request #1111 from christianmbrodbeck/label.color

Add Label.color attribute