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/
Build against different SASL versions.

Review: https://reviews.apache.org/r/14358
Preserved exit status when SIGTERM is received.

Review: https://reviews.apache.org/r/14153
Fixed formatting log output in signal handler.

Review: https://reviews.apache.org/r/14375
Fixed slave's finalize() method to not throw segfault.

Review: https://reviews.apache.org/r/14098
Merge branch 'master' into feature/Debian