auto strip trailing whitespaces
fix creation of parser class
added get_segment_efforts
fix for creation of parser class 2nd try
remove trailing whitespaces, wrap lines around 80 char
add request to client init so can easily override default (for caching)
test for get_segment_efforts
test_get_segment_efforts add datetime.datetime test
enable passing of Before and After parameters to the get_activities method
Merge pull request #17 from ghisprince/master

add get_segment_efforts, allow passing in of request_session for easy override, and a bug fix