Fix endian handling for date_time and timeval
Fix endian handling for date_time and timeval

bson_append_date_time wasn't doing little endian conversion and
bson_append_timeval was doing it instead of letting
bson_append_date_time handle it (it wraps date_time)

Fix that stuff

rcsanchez97/libbson,ksuarz/libbson,rcsanchez97/libbson,alexeyvo/libbson,derickr/libbson,remicollet/libbson,remicollet/libbson,mongodbinc-interns/libbson,rayyang2000/libbson,paulmelnikow/libbson,mapr/libbson,paulmelnikow/libbson,jqk6/libbson,rayyang2000/libbson,ajdavis/libbson,paulmelnikow/libbson,Machyne/libbson,Convey-Compliance/libbson,Machyne/libbson,jqk6/libbson,ksuarz/libbson,alexeyvo/libbson,derickr/libbson,Convey-Compliance/libbson,4Second2None/libbson_tmp,4Second2None/libbson_tmp,alexeyvo/libbson,bjori/libbson,derickr/libbson,ajdavis/libbson,rcsanchez97/libbson,mongodb/libbson,4Second2None/libbson_tmp,paulmelnikow/libbson,mongodbinc-interns/libbson,mongodbinc-interns/libbson,ksuarz/libbson,jqk6/libbson,derickr/libbson,paulmelnikow/libbson,ajdavis/libbson,mongodb/libbson,remicollet/libbson,mongodbinc-interns/libbson,mongodb/libbson,Machyne/libbson,Machyne/libbson,bjori/libbson,mapr/libbson,rayyang2000/libbson,bjori/libbson,Convey-Compliance/libbson,remicollet/libbson,4Second2None/libbson_tmp,rayyang2000/libbson,mapr/libbson,jqk6/libbson