Remove redundant robots "follow" meta tag, since it is default behaviour

Close #42
Change handle of enqueued stylesheet to use child theme name

See #39
Clarify docblock of thematic_create_stylesheet()
Merge pull request #43 from middlesister/feature/remove-default-robotstxt

Remove redundant robots "follow" meta tag, since it is default behaviour
Merge pull request #44 from middlesister/feature/change-stylesheet-id

Change handle of enqueued stylesheet to use child theme name
Close #39