Comment 1 for bug 502821

Added example.py and test for it. These very simple tests get us to 65% statement coverage:

txgenshi/__init__ 7 7 0 100%
txgenshi/example 21 21 0 100%
txgenshi/loader 58 46 0 79%
txgenshi/test/__init__ 1 1 0 100%
txgenshi/test/test_example 31 30 0 97%
txgenshi/test/test_util 11 11 0 100%
txgenshi/util 116 44 0 38%

100% coverage on loader will only require me to use genshistr in a test, so I'll add that. Not sure what's going on in util yet; I may save that for another bug.