Merge pull request #10 from aitherios/savon_log_fix

Adding sensible filters to savon
Merge branch 'savon_respect_log_level' of git://github.com/aitherios/mundipagg-ruby-api into aitherios-savon_respect_log_level

Conflicts:
	lib/mundipagg/gateway.rb
Testing merge from pull requests.
Merge pull request #13 from aitherios/frequency_enum

Fixing FrequencyEnum to access class variable FREQUENCY on Recurrency
Implementing instant buy key for credit card transactions
Merging