Added Unit tests to the SIMD parser

[sharmrj]

• Added the ability to parse TSVs
• We added tests that no longer depend on the old implementation (which also did not have tests)
  • We parse the test csv with the unstable parser.
  • Pretty-print the resulting DataFrame back into a canonical CSV form
  • We then parse the pretty-printed output again with the unstable parser.
  • Finally we assert that the two DataFrames are equal.

[mchav]

Looks good. The test cases are really thorough. Every time I was about to say "what about X" the test case existed. Thanks.