Add entries method for looping through table rows

[zabil]

Fixes: #412

Usage:

step("Almost all words have vowels <table>", function(table) {
  table.entries((entry) => {
    assert.equal(numberOfVowels(entry["Word"]), parseInt(entry["Vowel Count"]));
  });
});

step("Almost all words have vowels <table>", function(table) {
  table.entries((entry) => {
    const { Word } = entry;
  });
});

Signed-off-by: Zabil Cheriya Maliackal zabilcm@gmail.com

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