Update to jekyll 3.2.1

Minor update since v 1.1.0

Updated Gemfile to be compatible with gems: jekyll 3.2 and github-pages v93

Potential bug:

Liquid Warning: Liquid syntax error (line xx): Expected end_of_string but found pipe in...
Liquid Warning: Liquid syntax error (line xx): Unexpected character in...

See http://stackoverflow.com/q/39041062/1243763 for more details