Specify block-configuration

Helper function to build a YAML configuartion-string. This string is sent to the gist in a file named .block.

vw_block_config(license = "mit", height = 500L, scrolling = TRUE,
  border = TRUE)

Arguments

license	`character` specifies the license
height	`integer` height of the block (pixels)
scrolling	`logical` indicates to use scrolling bars
border	`logical` indicates to put a border on the `<iframe/>`

character yaml string for .block file