upgrade OrientDB version to 2.2.6 to match the one installed on TAP#464

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WafaaT wants to merge 19 commits intotrustedanalytics:masterfrom

WafaaT:DPNG-10248

Commits on May 27, 2016

code review comments addressed
WafaaT
committed

Commits on Jun 6, 2016

update existing graph for export to OrientBD plugin
WafaaT
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Merge branch 'master' into DPNG-7961
WafaaT
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fixed find or create vertex class name, considering the plocal mode in checking the database existance
WafaaT
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Commits on Jun 18, 2016

addressed code review comments
WafaaT
committed

Commits on Jun 20, 2016

Commits on Aug 9, 2016

Commits on Aug 19, 2016