add shortcuts to common classes/functions
simplified access to update http
search for edges based on src/dst string ids
merge ospf areas back into general function
white body for printing
inc ver
highlights for nodes and edges
example ipython notebook
update workbook
more notebook updates
move to gist
add tutorial
update tutorial
allow type casting in copy edge and node attribute functions
extend tutorial examples
bugfix: dont set if node not in graph
set default igp
auto list contributors from github api
workaround for gh-90
remove debug