Merge pull request ccgus#620 from robertmryan/master

Update transactions

Version 2.7.2

Merge pull request ccgus#589 from robertmryan/master

2.7.1

Merge pull request ccgus#589 from robertmryan/master

2.7.1

Update change log

Removed Swift variadic renditions

Revise tests

- Expand test coverage in general (there's a lot more to be done here, but making some headway)
- Check for step error in `executeUpdate` (as result of issue fixed in v2.6.2

Merge pull request ccgus#454 from robertmryan/master

Framework and Carthage Support

Release 2.5.2

version bump.