OBJExporter: handle children objects

+ scale factor param
OBJExporter: convert indents (spaces to tabs)
OBJExporter: remove useless check for object.children
Completed curve docs
OBJExporter: remove scaleFactor
OBJExporter: use object tag instead of group tag for object declaration
Changed [page] to [property]
Removed . from property
Fixed code style and added relevant examples
Disabling scissor test after rendering each frame to leave OpenGL state as it was
initial commit
merged exporter.constants with package constants
replaced threeio name with three/io_three naming conventions
fixed a bug were exporter.geometry was logging errors with incorrect formatting
fixed a bug were exporter.geometry was reporting, via logger, on data results incorrectly
migrated over main addon code
still needs testing, not ready for merging
removing __pycache__
setting .gitignore
began implementing the testing scripts
Fixed the html template
initial static geometry tests (without textures) are working
OrbitControls: Added access to angle values from the outside
buffer geometry export is working
scene with buffer geometry fixed
most scenes test
broken: scene tests with non-embedded geometry
can't test: scenes with textures
OrbitControls: Added methods getPolarAngle and getAzimuthalAngle
morph test is working
fixed buffer geometry formatting
added copyright
renamed custom Blender properties to THREE_ prefix
renamed the "round" attributes to "precision"
fixed a bug in review where it was trying load morph targets when there wasn't any
Updated readme files
Preparing for PR