add codeship status image
add codeship status image

paulrutter/oauth-1.0a,jay-bedeau-tc/oauth-1.0a,sudoprime/oauth-1.0a,jay-bedeau-tc/oauth-1.0a,MartinMoizard/oauth-1.0a,sudoprime/oauth-1.0a,MartinMoizard/oauth-1.0a,ddo/oauth-1.0a