[MacPorts] #37302: Update gcalcli portfile to use latest github version

[MacPorts]

#37302: Update gcalcli portfile to use latest github version
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 Reporter:  brian.andrew@…  |      Owner:  macports-tickets@…
     Type:  update          |     Status:  new
 Priority:  Normal          |  Milestone:
Component:  ports           |    Version:  2.1.2
 Keywords:                  |       Port:  gcalcli
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 Attached is a diff that updates the Portfile to use the lastest revision
 from Github.  Since upstream is not using tags and I wanted to make sure
 people got a consistent experience, I used the revision hash and epoch to
 control updates.  Also removed an unneeded dependancy on py27-elementtree.

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Ticket URL: <https://trac.macports.org/ticket/37302>
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