OPEN - task 2506: highcharts-export jdk 1.6 
https://github.com/highslide-software/highcharts.com/issues/issue/2506
ignore for eclipse dev.
OPEN - task 2506: highcharts-export jdk 1.6 
https://github.com/highslide-software/highcharts.com/issues/issue/2506
set jdk1.6 to jdk1.7, set build encoding UTF-8, and remove build plugin
manager section.
OPEN - task 2506: highcharts-export jdk 1.6 
https://github.com/highslide-software/highcharts.com/issues/issue/2506
remove maven build plugin manager from pom.xml
Merge pull request #2507 from takeseem/issue-2506

Issue 2506 highcharts-export jdk 1.6,need1.7