Allow for entry/item level attributes. (SimpleRSS.item_tags << 'entry#my_attr')
support for multiple tag category inside each item
Merge branch 'pr_upsteam/12' into stage
Merge branch 'pr_upsteam/7' into stage

Conflicts:
	lib/simple-rss.rb
Update gitignore and set default ruby version.

Also merged pull requests #7, #12 and #13 from upstream repository.