Fixed a memory leak in os::read().

From: David Mackey <tdmackey@booleanhaiku.com>
Review: https://reviews.apache.org/r/14336
Added SASL authentication support.

Review: https://reviews.apache.org/r/14310
Aligned column headers to top for consistent rendering.

"vertical-align: bottom;", which is Bootstrap's default for <th>
elements, renders inconsistently when the cell contains enough content
to wrap.

Nuking the style lets ".table th, .table td" win with
"vertical-align: top;" and renders consistently.

Review: https://reviews.apache.org/r/14328/