changed cobertura version to 2.6 (to support Java 7 syntax)

Change-Id: Id301a8d96a1ca73cbb281e484502a5dce506b5b1
Signed-off-by: Alexander Wert <alexander.wert@sap.com>
added LPESystemUtils.submitTask for concurrent task execution and
changed all creations of new threads to use that functionality

Change-Id: I0cd9a4c881e8ed62d56ae9e80e065273aabcb4d1
Signed-off-by: Alexander Wert <alexander.wert@sap.com>
Merge pull request #15 from AlexanderWert/master

execution of concurrent tasks using a thread pool