add benchmarks dir for testing app
add benchmarks dir for testing app

The first benchmark measures speed of otml generation.

The server it is run on must have the set of
published Investigations that the benchmark references.

In addition temporarily turn off page caching.

  ruby benchmarks/generate_otml_benchmark.rb

This benchmark measures the time to generate the 
otml for the current list of 11 published 
Investigations (twice):

  Development mode:  MRI: 849s, JRuby: 35s
  Production mode:   MRI:  30s, JRuby: 18s

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