Merge pull request #56 from AndreasSchacherbauerWikitude/Integration_4_0_2

Updates the Wikitude iSO SDK to version 4.0.2;
Adds a Wikitude SDK 4.0.2 workaround for the iOS plugin;

Signed-off-by: Andreas Schacherbauer <andreas.schacherbauer@wikitude.com>
Merge branch 'Integration_4_0_2' of github-wikitude:Wikitude/wikitude-phonegap into Integration_4_0_2