v0.17.0 "Mount Scott"

Full changelog since 0.16:

• Helper DSL for plugins (similar to the Liquid Filter DSL) #135 (jaredcwhite) (docs)
• Process data cascade for folder-based frontmatter defaults #139 (jaredcwhite) (docs)
• Execute block-based filters within object scope #142 (jaredcwhite)
• Provide a Liquid find tag as easier alternative to where_exp #101 (jaredcwhite) (docs)
• First pass at implementing site locales and translations #131 (jaredcwhite)
• Add international character slug improvements #138 (jaredcwhite & swanson)
• Switch to processing Ruby front matter by default #136 (jaredcwhite)
• Switch from AwesomePrint to AmazingPrint #127 (jaredcwhite)