[NO_MERGE] [JENKINS-16316] - Bug fix and additional tests#14

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kazesberger wants to merge 3 commits intojenkinsci:masterfrom kazesberger:master

+172-24

Commits on Apr 26, 2013

global properties were overwritten by Environment Variables of the
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Commits on May 8, 2013

using 1.444 jenkins (minimum required jenkins version)
kazesberger
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Commits on May 15, 2013

reworked: Change Of Global Property Gets Recognized When Without Job
kazesberger
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