Merge pull request #17 from swirlycheetah/develop

feature: usd conversions from dogecoin and bitcoin
Merge pull request #18 from swirlycheetah/develop

remove completed feature from roadmap
Merge branch 'develop'
Merge branch 'develop'
Merge pull request #19 from swirlycheetah/develop

widget work to master
Merge pull request #21 from swirlycheetah/develop

various widget example amendments
Merge pull request #22 from swirlycheetah/develop

widget page with examples
adding version details to readme