read_edgelist [citationnet]

In citation_net:
- function read_edgelist
include gitignore
.
more reading functions for multiplex

- function to read citation file only
- function to read meta file and to build collab network as well as
multiplex interconnections out of this
minor bugfixes
working commit …
include multiplex pickler
remove debug print
bug fixes
Merge branch 'NewFeatureBranch'
gitignore