Changes thousands separator for SEK to correct value.
Updates changlog and authors files.
Updates tests for new thousand separator for SEK.
Merge pull request #301 from alex-ross/master

Updates thousands separator for SEK to correct value.
Add russian_central_bank to README
Merge pull request #302 from rmustafin/russian_central_bank_to_readme

Add russian_central_bank to README
Actually should only allow to multiply a money by a number
More readable by using if else
Update CHANGELOG and AUTHORS
Merge pull request #305 from viettienn/correct-money-multiply-operation

Actually should only allow to multiply a money by a number
Use coerce to allow reversed argument order when doing mathematical operations.
Updated AUTHORS and CHANGELOG
Remove un-necessary self
Never have to check the same currency as it is done in bank#exchange_with, remove some unnecessary self.
Merge pull request #307 from andriusch/master

Allow reversed order of arguments when doing mathematical operations
Merge pull request #308 from RubyMoney/refactor-arithmetic-module

Refactor arithmetic module