Viewer import path adjusted
removed proxy method Viewer.addChapter; some names translated to english
more Viewer refactoring
adjustments for handling the default lights
adjustments for handling the default lights
removed redundant, unused code
Merge branch 'master' of git://github.com/jpablo/geomdif
added example for Curve3D
new schema for defining functions with parameters
Merge remote branch 'renato-geomdif/master'
#42: algunos detalles faltantes (orden y nombres de capítulos)
#33: Presentación: Añadir texto introductorio en presentación (Punto 2 de Ana Irene)
Superficie1: example of adding an equation to a page
Merge branch 'master' of git://github.com/jpablo/geomdif
Textos y fórmulas, 'Isues' #34, #35, #36, #39, #41.