Methods clear-after-set created

Adicionados métodos para eliminação de labels, cores e ícones (métodos "clear" e "reset", para vértices e arestas.

Adicionados métodos (API de C++):

bool GraphViewer::clearVertexLabel(int id)

bool GraphViewer::clearEdgeLabel(int id)

bool GraphViewer::clearEdgeColor(int id)

bool GraphViewer::clearVertexColor(int id)

bool GraphViewer::clearVertexIcon(int id)

bool GraphViewer::resetEdgeColor()

bool GraphViewer::resetVertexColor()

bool GraphViewer::resetVertexIcon()

bool GraphViewer::clearBackground()

April 2017

This release fixes the bug related to using nodes without labels. Now a node can be rendered with no label associated with it.

Current version (Mar/2017)

1.0

added docs