Soften Nokogiri dependency to make it more compatible with others
Soften Nokogiri dependency to make it more compatible with others

Nokogiri <= v1.6.5 make Twemoji impossible to use with project that already
using Nokogiri v1.6.6.x.

Nokogiri v1.6.2 fixed security issues with version v1.6.1, so let's
specify Nokogiri to start with v1.6.2, ref. http://git.io/vmSTS.

jollygoodcode/twemoji,vevix/twemoji