Benchmark file load performance

[fulldecent]

Design a way to reliably measure the performance of TableTool. This will be an important part of improving the performance of TableTool.

Maybe this can be a headless load inside the Travis build (see #57).

• Load time for an empty CSV file
• Load time for file CSV file with 500 rows and 10 columns, each cell is 12345
• Load time for file CSV file with 10 rows and 500 columns, each cell is 12345
• Load time for file CSV file with 2000 rows and 2000 columns, each cell is 12345

"Load time" is processor time until file is usable

[fulldecent]

Here are two data files for testing:

a.csv.zip FL_insurance_sample.csv.zip