Fix Resolver#create_tsig_options visibility.

[keithrbennett]

• Make Resolver#create_tsig_options public instead of private to fix error.
• Add require to tc_dnsruby.rb so it will pass when called individually.

[keithrbennett]

Also, I removed the comments from Resolver#tsig= that referred to passing multiple arguments.

[coveralls]

Coverage increased (+0.01%) to 75.75% when pulling 4ab7f4a on keithrbennett:fix-create-tsig-options into 741b3d9 on alexdalitz:master.

[coveralls]

Coverage increased (+0.01%) to 75.75% when pulling 4ab7f4a on keithrbennett:fix-create-tsig-options into 741b3d9 on alexdalitz:master.

[coveralls]

Coverage decreased (-0.18%) to 75.56% when pulling 4ab7f4a on keithrbennett:fix-create-tsig-options into 741b3d9 on alexdalitz:master.

[keithrbennett]

Removed "=> _e" from rescue since there was an end immediately following it.

[alexdalitz]

Hi -

Thanks for this!

I've used the tc_dnsruby fix separately. The TSIG and AXFR stuff is also addresses separately, so I'm going to close this pull request.

Thanks!

Alex.