Added command line options to override those in benchmark file. #99
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Let's the user provide the following options on the command line to override those options in the benchmark file:
baseUrl - (no default, must be provided on command line or contained in benchmark file)
concurrency - defaults to 1 if no benchmark file is provided
iterations - defaults to 1 if no benchmark file is provided
rampup - defaults to 0 if no benchmark file is provided.
Note that this makes providing a benchmark file optional.
This commit also changes a few types and function signatures to better protect against bad user input.