fix #134. add benchmark tool and sample configuration.

* Can run multiple load definitions
* Can write to multiple series
* Can define int, float, bool, and string columns
* Can write in batches
* Reports results to an InfluxDB instance
Add benchmark configuration file
fix #141. Include the benchmark binary in the package
fix the default config path
ignore the benchmark binary
Fix logic for waiting until all requests are done before quiting process
Seed the random number generator
Add ability to send in random strings
Add output to benchmark log
Wire up running queries on load test
Merge pull request #174 from influxdb/add-benchmarking-tool

Add benchmarking tool