Improved assertions/test output

[twolfson]

Based on #91, update base before landing

I have no idea how we missed this before but test output was always kind of bad for now reason. It was a relatively quick fix to improve it. In this PR:

• Added line numbers to each output (sadly can't be extracted due to $LINENO being line-sensitive)
  • Tried shunit2 technique with ${assert_equals} but it evaluated single quotes strings (thus breaking all our backticks), https://github.com/kward/shunit2/blob/v2.1.8/shunit2#L192
• Fixed newlines being lost in make test output
• Corrected JS-based !== to !=

Notes:

• We briefly explored building out our own assertions (e.g. fail, assert_equals) (benefit of seeing expected/actual values) but it felt like we were going to rebuild the wheel (e.g. shunit2)
• That's fine but feels like unnecessary work when the existing "wheel" works fine, this is mostly polishing the wheel

Before:

After:

/cc @rpdelaney

[twolfson]

Same comment as #91, it's been 10 days, assuming @rpdelaney is still moving. Going to review and land

[twolfson]

This has been landed in 1.1.0