Config: Added rubygems metadata.
Merge pull request #3 from danzajdband/feature-rubygems-integration

Config: Added rubygems metadata.
Fix: Expose Installments#list instead of #retrieve
Merge pull request #4 from wacko/fix/installments-list

Fix: Expose Installments#list instead of Installments#retrieve
Released version 0.0.2.