[Yaml-core] Small Issues

[Oren Ben-K. <or...@ri...>]

- Using an empty type string (just a '!') should force implicit transfer
method detection on any scalar:

integer: ! "12"

- It would be more consistent to change '|-' to '||':

\  -     folded, not escaped
\\ -     folded,     escaped
|  - not folded, not chomped
|| - not folded,     chmoped

- Brian correctly noted that

--- !map
--- ...

Isn't covered in the current spec. It requires messing the productions
pretty bad, however... I guess I'll just have to do it in the next draft :-(

- Brian complained about some spacing issues which seem to come from a
browser bug in displaying links within a text (the spaces around them get
messed up). I've no idea how to fix that. I may be able to make the
productions tables more robust, however. Perhaps we should create a PDF
version as well :-)

- Brain also wanted a leading '---' in the log file example. The very first
'---' one is optional...

Have fun,
    Oren Ben-Kiki