sprint-15

What's Changed

• Release/sprint 14 by @mjtravers in #234
• Update Transaction Identifiers by @Elaine-Krauss-TCG in #236
• Updates requirements file by @Elaine-Krauss-TCG in #241
• Feature/237 aggregation groups by @Elaine-Krauss-TCG in #240
• Feature/479 contribution aggregations by @toddlees in #242
• Feature/172 itemize by @toddlees in #244
• 159 edit contact from transaction entry by @dheitzer in #239
• Added state field to contact update when a transaction is modified by @mjtravers in #245
• Fix for retrieving previous transaction for aggregate contribution by @mjtravers in #246
• other reciepts -> other receipts by @toddlees in #249
• Release/sprint 15 by @dheitzer in #248

Full Changelog: sprint-14...sprint-15