Update core to 1.0.1. (tensorflow#1619)

INTERNAL

Update tfjs-core to 1.0.0 and remove tag --next (tensorflow#1607)

INTERNAL

Update core to 1.0.0-alpha5. (tensorflow#1600)

INTERNAL

Update tfjs-core to 1.0.0-alpha4. (tensorflow#1591)

INTERNAL

0.15.x: Update core to 0.15.4. (tensorflow#1584)

INTERNAL

Bump version to 0.15.3 (tensorflow#1572)

Bump version to 0.15.3

Update core to 1.0.0-alpha3 (tensorflow#1565)

INTERNAL

0.15.x: Update to 0.15.2. (tensorflow#1567)

INTERNAL

Update core at master to 1.0.0-alpha2 (tensorflow#1552)

DEV

Update 0.15.x to 0.15.1. (tensorflow#1551)