Get first spec working for intial push model
WIP: still implementing tests.
Tests working.
Extract shared examples for balance calculator
Implement step two
Implement step 3
Pushing lines around
Implement step 04
Implement step 06
Remove redundant private method
Implement step 06
Implement step 07
Implement step 08
Implement step 09
Implement step 10 :punch:
Merge pull request #1 from tom025/master

Ruby Version