Adds project logo.

README.md

@@ -1,9 +1,12 @@
-mtail - extract whitebox monitoring data from application logs for collection into a timeseries database
-========================================================================================================
+<img src="https://raw.githubusercontent.com/google/mtail/master/logo.png" alt="mtail" title="mtail" align="right" width="140">
+
+# mtail - extract whitebox monitoring data from application logs for collection into a timeseries database
 
 [![GoDoc](https://godoc.org/github.com/google/mtail?status.png)](http://godoc.org/github.com/google/mtail)
-[![Build Status](https://travis-ci.org/google/mtail.svg)](https://travis-ci.org/google/mtail)
-[![Coverage Status](https://coveralls.io/repos/github/google/mtail/badge.svg?branch=master)](https://coveralls.io/github/google/mtail?branch=master)
+[![Build
+Status](https://travis-ci.org/google/mtail.svg)](https://travis-ci.org/google/mtail)
+[![Coverage
+Status](https://coveralls.io/repos/github/google/mtail/badge.svg?branch=master)](https://coveralls.io/github/google/mtail?branch=master)
 
 `mtail` is a tool for extracting metrics from application logs to be exported
 into a timeseries database or timeseries calculator for alerting and
@@ -13,8 +16,7 @@ It aims to fill a niche between applications that do not export their own
 internal state, and existing monitoring systems, without patching those
 applications or rewriting the same framework for custom extraction glue code.
 
-The extraction is controlled
-by [mtail programs](docs/Programming-Guide.md)
+The extraction is controlled by [mtail programs](docs/Programming-Guide.md)
 which define patterns and actions:
 
     # simple line counter
@@ -27,16 +29,15 @@ Metrics are exported for scraping by a collector as JSON or Prometheus format
 over HTTP, or can be periodically sent to a collectd, StatsD, or Graphite
 collector socket.
 
-Read the [programming guide](docs/Programming-Guide.md)
-if you want to learn how to write mtail programs.
+Read the [programming guide](docs/Programming-Guide.md) if you want to learn how
+to write mtail programs.
 
 Mailing list: https://groups.google.com/forum/#!forum/mtail-users
 
 ### Installation
 
-`mtail` uses a Makefile.  To build `mtail`, type `make` at the commandline.
-See the [Build instructions](docs/Building.md) for
-more details.
+`mtail` uses a Makefile. To build `mtail`, type `make` at the commandline. See
+the [Build instructions](docs/Building.md) for more details.
 
 ### Deployment