Some tests are doing validation of privateNodeRSA objects instead of publicNodeRSA

[enver]

There are 3 tests that validate privateNodeRSA object when instead they should validate publicNodeRSA.

it('should gracefully handle data outside of encapsulation boundaries for pkcs8 public keys', function () {
    let publicFileWithNoise = 'Lorem ipsum' + fs.readFileSync(keysFolder + 'public_pkcs8.pem') + 'dulce et decorum';
    let publicNodeRSA = new NodeRSA(publicFileWithNoise);
    assert.instanceOf(privateNodeRSA.keyPair, Object);  <== It should be publicNodeRSA
    assert(publicNodeRSA.isPublic());
    assert(publicNodeRSA.isPublic(true));
    assert(!publicNodeRSA.isPrivate());
});

[rzcoder]

Thanks! Merged.