Merge branch 'develop' into doc
Merged last changes in "signal.hpp" to document
Added file author, purpose and version
Added class description
Added documentation to signal class and some basic naming conventions
Moved constructors/destructor to the top of public region
Public/private sections now has identation

Logic says that public/private sections should be treated just as labels.
But remove they identation make them harder to see, so this time, we are
going to stay practical.
Merged all documentation/restyling of signal.hpp