Resolves issue #72

[a3dho3yn]

This PR will:

• prevent trimming whitespaces from the beginning of lines
• prevent considering first element of an entry as TTL
• consider both null and empty domain-name as not stated

Closes #72

[a3dho3yn]

The Parser::processLine sets TTL for all records equal to the default value. Then the null === $this->currentResourceRecord->getTtl() criteria on Parser::populateWithLastStated will be always false and the parser will never uses the last stated TTL (which is the desired behavior based on RFC1053).

Omitted class and TTL values are default to the last explicitly stated values.

This is why ReverseRecordTest::testParseReverseRecordFile fails.

[a3dho3yn]

@samuelwilliams any comments?

[fshafiee]

That'd be nice if we could see this merged to the main repo.

[a3dho3yn]

@samuelwilliams @srsbiz @skirmis is there any problem with this PR?