Various Ranged Float widget fixes (but still a bug .... )
Various Ranged Float widget fixes (but still a bug .... )

- added min - max mini label over the slider
- fixed reg exp validation
- BUG : with value 1 the torus is not created and "three.min.js" raised
"Uncaught TypeError: Cannot read property 'x' of undefined". I attach
the stacktrace :

THREE.Vector3.subVectors @ three.min.js:42
THREE.Geometry.computeFaceNormals @ three.min.js:212
geometryNeedUpdate @ MeshFile.js:101
updateThreeMesh @ MeshFile.js:155
_addLayer @ Scene.js:226
addLayer @ Scene.js:313
TorusFilter._applyTo @ Create.js:87
(anonymous function) @ Plugin.js:245
(anonymous function) @ Component.js:212
jQuery.event.dispatch @ jquery.js:5095
elemData.handle @ jquery.js:4766

cignoni/meshlabjs,cnr-isti-vclab/meshlabjs,cnr-isti-vclab/meshlabjs,cignoni/meshlabjs,cnr-isti-vclab/meshlabjs,cnr-isti-vclab/meshlabjs,cnr-isti-vclab/meshlabjs,cignoni/meshlabjs,cignoni/meshlabjs,cignoni/meshlabjs