Collada
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-Fixed some DAE import & export bugs
-Changed Collada exporter to use the mesh loops API
-Added tangent export to Collada exporter
-Added triangulation option to Collada exporter
-Changed a little how normalmaps are handled in shader. Not sure if it's working properly, be careful.
-Fixed some strange bug with kinematic bodies #776
-Fix release compilaiton issues #782
Fix ios build error
Merge pull request #790 from marynate/PR-fix-ios-build

Fix ios build error
fix view dependent problem in normal mapping
Merge pull request #792 from romulox-x/normalmap-view-bug

fix view dependent problem in normal mapping
Fixes
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-Fixed normalmap depth parameter
-Fixes to DirAccess on Windows
-Double click on resource dock will open them
-Fixes to doc generator (should make github wiki on class list more up to date)
-do not use calc_tangents if no UVs
-added custom metadata to physics shapes (2D only for now)
-gizmos are not displayed in camera preview