ds
coauthors

* simplified code
* added threshold
* added edge weight attribute
topn

now takes int or float. if float, returns topn%.
cleanup and documentation
convert list attributes to strings
docs
Merge branch 'erick' into python
ds
added from_dir to dfr parser, started command line parser
dfr from_dir
more command-line

* all networks now accept **kwargs, to facilitate streamlined calling
from __main__
added **kwargs param to author_coupling
cocitation issues
finished command-line wrapper
cleanup
Merge branch 'erick' into python
Merge branch 'python' of https://github.com/diging/tethne into python