Implement Buffer mechanism

[shrikrishnaholla]

As of v0.1, every message is generating a separate write operation to a file. Even with a lower messages/minute, this is slow. So a buffer mechanism is to be implemented; ie, buffer incoming messages when busy and write into file when idle. This would make searching a little complicated, but would vastly improve performance. Before merging, compare the performance of the two approaches to evaluate whether the performance really improves as theorized. Refer to this discussion in #1