Helpers.cs: Added Axis2Rot(llVector3 axis) to convert axis rotations to quaternions.
Helpers.cs: Added Axis2Rot(llVector3 axis) to convert axis rotations to quaternions.

git-svn-id: c32cf1ecefca26b8770d7b0740bc0c5c174087e4@920 c754d5e9-d413-0410-bcdf-9574c9dba6b7

jhs/libopenmetaverse,jhs/libopenmetaverse,jhs/libopenmetaverse,jhs/libopenmetaverse