dev-ruby: add ast

Change-Id: Iea8a6fa22127f24d14fa0ec3ba562c8ee6135757
dev-ruby: add slop

Change-Id: I6ab6812db435c36622e1890e3d29b3b4561da342
dev-ruby: add parser

Change-Id: Iced90adf1df54302c6852ef0c70078fe086c6f6f
dev-ruby: add powerpack

Change-Id: I2181e5e6f56b13f75244bce81f38e532c3ceffbd
dev-ruby: add rainbow

Change-Id: I5be4d437c80fcc3b7ddcc8bfcb3f83520ecf2ce7
dev-ruby: add rubocop

Change-Id: Ibf4205d3e0bfec45485a86e5f8f83b1c1627bd3b