Fix broken cassette

space encoding seemed to be wrong. WAT.
Forcing version 1.9 of webmock
Fixing cassettes again
Changing Gemspec to be < 1.10
update development dependencies to webmock 1.9.3
Fix inconsistent cassettes
Fix broken invoicing cassette
Lock webmock to 1.9.3
Merge pull request #163 from theodi/feature-cassette-fix

Fix broken cassette