levels for getopt

levels for getopt:
Usage:
$ python new_editor.py -o data/edits2011.json -n data/edits2012.json -l
1,2,3,4,5,6,7,8,9,10,50,100,500,1000
2012-01-01 - 2012-06-30
new editors with more than 1 edits:      53
new editors with more than 2 edits:      43
new editors with more than 3 edits:      40
new editors with more than 4 edits:      39
new editors with more than 5 edits:      36
new editors with more than 6 edits:      34
new editors with more than 7 edits:      33
new editors with more than 8 edits:      32
new editors with more than 9 edits:      31
new editors with more than 10 edits:     30
new editors with more than 50 edits:     11
new editors with more than 100 edits:    5
new editors with more than 500 edits:    2
new editors with more than 1000 edits:   2