Check-tls-certs

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* Get current time once to avoid duplicate expiry messages.
[fschulze]

* Mark certificates from staging server with error.
[fschulze]

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* Fix comparison if there is no expiration time.
[fschulze]

* Allow port in domain name, to which the ssl connection is made instead of the
default 443, be specified.

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* Use UTC time to calculate expiration time.
[fschulze]

* Add another verbosity level (and remove ``-q/--quite``). By default nothing
is printed except when there are errors. The first level ``-v`` always
prints the earliest expiration date. The second level ``-vv`` prints all the
info.

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* When prefixing a domain with a ``!`` the certificate will not be fetched and
checked, but it's name well be checked to be in the list of alternate names.
[fschulze]

* Change handling of alternate names, so checking for just one domain when a
certificate is valid for several works.
[fschulze]

* By default only print messages for domains with errors. Use ``-v`` option
to print infos for all domains.
[fschulze]

* Allow comments starting with ` in domain file.
[fschulze]

* Get rid of ``openssl`` executable requirement.
[fschulze]

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* Use asyncio to fetch certificates in parallel.
[fschulze]

------------------

* Actually support Python 3.4 as advertised.
[fschulze]

* Fix packaging.
[witsch]

* Round expiry time delta to minutes for nicer output.
[fschulze]

* Skip duplicate messages for alternate names.
[fschulze]

* Add certificate issuer to output.
[fschulze]

* Mark sha1 certificate signature as error.
[fschulze]