[tor-bugs] #18792 [CollecTor]: tweak build.xml for new tasks and java 7

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#18792: tweak build.xml for new tasks and java 7
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     Reporter:  iwakeh       |      Owner:  iwakehc
         Type:  enhancement  |     Status:  new
     Priority:  Medium       |  Milestone:
    Component:  CollecTor    |    Version:
     Severity:  Normal       |   Keywords:  ctip
Actual Points:               |  Parent ID:  #18707
       Points:               |   Reviewer:
      Sponsor:               |
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 * add `clean`, `test`, and `jar` ant-tasks
 * provide necessary properties and appropriate initialization for new
 tasks
 * switch to source/target java 1.7
 * provide version information for dependencies and use released descriptor
 * use lib folder for dependencies

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18792>
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