Fix 'Log' and 'Edit' link URLs.
Add link to Bugs20130715.
Add link to Adam Chlipala's OCaml/SML comparison page.

Thanks to Chad Dougherty for the link suggestion.
Merge pull request #54 from MatthewFluet/guide-updates

Miscellaneous updates to guide.
Update CallingFromSMLToC.adoc

Added -export-header export.h so that the command compiles successfully.
Merge pull request #56 from bikal/patch-1

Update CallingFromSMLToC.adoc