v1.13.0 - 87% size reduction

version	size
terraform@1.11.1	53M
terraform@1.13.0	6.8M

Stylus, Less, CoffeeScript, are removed as dependencies and are now opt-in.

Node v5.x compatibility

• Node v5.x compatibility
• Updates Node-sass
• Updates Autoprefixer

node v4.x compatability

v0.12.0

node v0.4.x compat