Minor tweaks
Reorganize error code; fix #58
Reference to transparent encryption blog post
note on cxn state; fix #57
tweak rows.Close() err handling; fix #46
Upgrade to kramdown; fix #45
Add notes about prep stmt support; fix #41
Document type-conversions in Scan(); fix #38
Document txn and cxn state; fix #37
Add leftnav for new Errors page
Increase sidebar, shorten titles; fix #28
Warn about improper defer; fix #26
Document reconnect/retry; fix #25
Rearrange prep stmts; fix #22
Merge pull request #59 from VividCortex/tweaks

Various tweaks and updates