Renamed docs/dev/ to docs/draft.

--HG--
rename : docs/dev/_testpygments.rst => docs/drafts/_testpygments.rst
rename : docs/dev/_testvimsyntax.ttl => docs/drafts/_testvimsyntax.ttl
rename : docs/dev/extendingtayra.rst => docs/drafts/extendingtayra.rst
rename : docs/dev/primer.rst => docs/drafts/primer.rst
rename : docs/dev/reference => docs/drafts/reference
rename : docs/dev/reference.rst => docs/drafts/reference.rst
rename : docs/dev/sandboxing.rst => docs/drafts/sandboxing.rst
- Added syntax to prune leading and training whitespace of tag's content.
- Refactored tag-handling logic in ast.py module.
- Documentation.