This commit will append both mandatory and optional  prototype
parameters to the component params.libsonnet file on `ks gen foo ...`.

Default values will be used for optional params where the user does not
specify flags to `ks gen foo ...`.

Because we are trying to append to jsonnet, we will have to traverse the
AST to first identify the location of where to insert the new component
params. New components will be inserted at the bottom of the components
object, with the params ordered alphabetically.

Fixes #35

Basic skeleton.  Can evaluate jsonnet and show the output as yaml or
json .. and that's about it.