Version export check compares version values for root objects against
export selection and raises warning if mismatched.
Root object nif version, user version and userversion 2 are compared
against all child objects, any mismatch will raise an error.
Merge pull request #166 from Ghostwalker71/export/version_check

Export/version check
Added vertex alpha section and expanded the information for InvMarker
and BSInvMarker
BSX and UPB documentation
Add iosettings rst to user features section of documentation for import
and export settings.
Expanded import settings documentation. Changed name of one import
operator setting to be more descriptive.
Expanded export settings documentation. edited name of operator
More export settings documented for user.
Update contact info and blender version in init info
Removed register and unregister for ui module that no longer exists.
Merge pull request #169 from Ghostwalker71/documentation/geometry

Documentation/geometry
Fix catch for exporting a parented mesh with no armature modifier
applied. submitted by misternad in irc
Merge pull request #171 from Ghostwalker71/fix/modifier_catch

Fix catch for exporting a parented mesh with no armature modifier
Fix for the dismember check also removed bad register in the init.
Merge pull request #173 from Ghostwalker71/fix/broken_link

Fix for the dismember check also removed bad register in the init.
Cleaner fix for the ungrouped vertices block. plus a todo off the list
as well.
Merge pull request #174 from Ghostwalker71/fix/broken_link

Cleaner fix for the ungrouped vertices block. plus a todo off the list
12-83 Shader set is exporting with some minor mismatches in data
Image slots 7 thru 9 process. Clamp mode and Image scale import and
exporting for 12-83 material
shader.