[content] support custom extra tags
support custom extra tags in profile pop-up

starts fixing #29
[content] support custom extra tags pt.2
support custom extra tags on profile pages

finishes first implementation of #29

updated sugar.js to custom version including String#humanize(),
String#pluralize() etc.
[options] updated text

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still contained info about push
Merge branch 'dev-custom-extratags' into version-0.4