Provide content for tarantool.org/benchmarks.html

We need the following types of benchmarks done and made available online:
- start speed for a given data set (say, a million tuples). Show the growth of start up speed with growth of the data set. The following dimensions of growth are possible: size of the tuple, number of tuples, number of spaces
- save snapshot speed, for the same cases/scenarios
- write latency, insert/update/delete
- select latency
- write throughput (we already do these with nosqlbench, need to redo with Yahoo! toolkit)
- read throughput (same, need to be redone with Yahoo! toolkit)
- memory footprint benchmarks.