v0.13.0 "Klickitat"

• Configurable setting to allow executable Ruby code in Front Matter #9
• Honor the configured site encoding when loading Liquid components #33
• Allow configuration file as well as site metadata file to pull YAML options out of an environment specific block #34
• Add Faraday to the default set of gems that get installed with Bridgetown #30
• Add blank favicon.ico file to prevent error when generating a new site for the first time #32 (jaredmoody)