update DTP to store dates as dates internally.
Allow date fields to handle Ranges.
Merge branch 'master' of github.com:promedical/hippo
Allow date fields to handle Ranges. Take 2.
Handle separator regexp's properly.

Uses Regexp.escape to handle when separators may be invalid
regexp characters ('*').
Remove whitespace when separated by separators.
If the current segments has no fields specified return emtpy string.
Remove empty segments when parsing.
Skip removing empty field whitespace or repeating composite separators for fixed width segments.
Update CHANGELOG and version.
Remove whitespace before removing extraneous separators.
Whitespace correction.
Fix typo in Hippo date processing.
Bump version to 0.4.1.
Add guard-minitest to Gemfile.
Update rake version.
Handle removal of empty fields properly.
Refactor TransactionSets::Base.grouped_components.
Add rb-fsevent to Gemfile (for guard).
Remove old comment line.