Merge pull request #25 from jcheng5/master

Fix % escaping in comments
Cleansed paste0
Rearranged ID/Class identification to ensure duplicated weather widgets wouldn't have more than one of the same ID.

Closes #29
Require opt-in for numeric ticker.

Closes #31.
Support placement of the legend in any of the four corners.

Closes #27.
Use numeric class rather than custom data element.

Closes #30.
Update non-child ancestors of HTML Widget.

Closes #32.
Sanitized package dependencies, removed internal validateCssUnit call now that it's exported.

Closes #21, Closes #16
Initialize resource path in all codepaths