Revert "Merge pull request #64 from recurly/balance-in-cents"

This reverts commit e7e55983b010d3766932d5c1cbaa2cc48decb29d, reversing
changes made to 1061709c570f0a73a44ad1854144300d8d7cb3ca.

Fixes #116.

Conflicts:
	Tests/fixtures/accounts/show-200.xml
Merge pull request #118 from recurly/revert-64

Revert "Merge pull request #64 from recurly/balance-in-cents"