Update Loader.js

Changes 1 KB = 1000 B to 1024 KB = 1024 B
Adding boolean attribute "transparent" for files with transparency. 

http://stackoverflow.com/questions/18444939/define-transparent-material-in-json-model-format-3-1
updated transform controls
Merge branch 'dev' of https://github.com/arodic/three.js into dev
Merge branch 'dev' of https://github.com/mrdoob/three.js into dev
Fix to Raycaster.js to return calculated vertex and index info for BufferGeometry.
Removed vertices from intersection object.
Indentations to tabs.
Merge branch 'buffergeometry_raycasting_vertices' of https://github.com/tsherif/three.js into dev
Raycaster: Minor clean up.
WebGLRenderer: Geometry2 dispose.
BufferGeometry: Removed unused flags.
Added buffergeometry interactive example.
Updated builds.
SceneLoader: Removed double slash. Fixes @erno case in #4262.
BinaryLoader: Removed double slash.
Updated builds.
Random improvements.
More example tweaks.
Moved WebGLRenderer sortFacesByMaterial to Geometry.makeGroups as per @wivlaro's #3432 PR.