edits to handle issue "networks.nx_biblio_coupling() chokes if record has no citations;" added a check for empty citations data in nx_biblio_coupling() and added an associated test case in the networks_test module in the section corresponding to the bibliographic coupling network
resolved an issue with .sif file formats by using NetworkX multigraphs; added associated test cases
updated version number
improved file name references so that test case will run no matter where it is run from
expanded test cases
Merge pull request #10 from aabaker99/mybranch

Word.