yrmcds version 1.1.5

This release fixes an important bug that blocked the master for unexpectedly long duration
when one of its slaves silently dies. Two new config options were introduced with the fix.

• repl_buffer_size adjusts the replication buffer size in the master process.
• slave_timeout adjusts how long the master waits a non-responsive slave before cutting the connection.

Other two minor bugs were fixed too. See ChangeLog for the full details.