converted line feed code(CRLF) of source files to LF.
formatted the LICENSE document.
separate import pmx test
fix import pmx

change way to read Indexes
correct readIndexes
deleteTipBones causes Bug so default is now False
support RotationIK
fixed the bug that "face normals" of a model imported from pmx is inverse.
added the feature importing rigid bodies and joints from pmx files.
fixed incorrect limits of rigid body constraints.
added margin frames property to vmd importer for rigid body dynamics.
added the feature for configuring scene settings easily.
changed default margin time for vmd animation.
fixed a bug caused by empty object scale.
fixed coordinate conversion.
changed the method of tracking rigid bodies.
removed unnecessary comments.
fixed limits of joints.
set 0 as IK influence values of dynamics bones.
added the properties for rigids and joints.
added a parameter for hiding rigids and joints.