added 004010x091a1/hp835 transaction set

summary of changes:
- added the above transaction set.
- commented out some code in lib/stupidedi/versions/functional_groups/005010/segment_defs.rb that was causing autoload warnings.
- commented out line 5040 of  lib/stupidedi/versions/functional_groups/004010/element_defs.rb - this may need review
- added new fixture and basic tests for parsing an 835 file for the above transaction set, all of which pass.