Adds support to use objects for options in contentTags, issue: 325
Adds a new selectTag helper that allows us to specify a selected option
Updates the documentation to add the new selectTag helper
Merge branch 'master' of https://github.com/mde/geddy into switachable-template-support
Merge branch 'switachable-template-support' of https://github.com/mde/geddy into switachable-template-support