Removed extra whitespace.
PEP fixes, added virtualenv to gitignore.
Merging
Merging
Merged from master. Added weight parameter to add_edge() method. Tests now account for the extra parameter.
Merged from master. Added weight parameter to add_edge() method. Tests now account for the extra parameter.
Added dijekstra's algo and associated test
Added skeltons for second algo.
Renamed function
Fixed merge conflicts