0.18.0

Breaking:

• Renamed --search-path to --search-paths in eval and compile, enabling multiple paths for jsonnet/jinja2 and adding support for jsonnet bundler (#133)

Updates:

• Inventory and folders caching; only compile targets that changed (#134)
• Updated reclass to v1.5.5 (#135)
• Updated jsonnet to v0.11.2 (#136)