Log Message:
Update thin to 1.5.0.

== 1.5.0 Knife
 * Fix compilation under Ubuntu 12.04 with -Werror=format-security option.
 * Raise an error when no PID file.
 * Prevent duplicate response headers.
 * Make proper response on exception [MasterLambaster].
 * Automatically close idling pipeline connections on server stop [MasterLambaster].