Update live_editor.dryml

Use of <part name="my-part"> doesn't work in Hobo 2.0. Changed to use a <div> with part attribute. Added additional context for using the tag, as well as example styling that can be passed (to help newbies).
Correct the config.hobo.show_translation_keys name
Add a link to the screencast
Update dryml-guide.markdown

fixed typo
Merge pull request #2 from silvrbak/patch-1

Update dryml-guide.markdown
Merge remote-tracking branch 'hobodoc/master'