Address deprecation warnings and Liquid related errors. #172
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Fixed the following warnings & errors:
DEPRECATION WARNING: Passing a string to call() is deprecated and will be illegal in Sass 4.0. Use call(get-function("...")) instead.
Liquid Warning: Liquid syntax error (line 3): Expected dotdot but found id in "(page.header.overlay_color or page.header.overlay_image) or page.header.image" in /_layouts/talk.html
Deprecation: The 'gems' configuration option has been renamed to 'plugins'. Please update your config file accordingly."