Update sendMMSBarcode.md

fixed schema url ( missing /platform )
Update sendSavedMMS.md

Fixed Schema url (missing /platform)
Update getSendingStatistics.md
masons changes
Merge pull request #4 from mtan810/master

API, Github markdown version
Update getSendingStatistics.md
Update SUBSCRIBER_STATUS_POSTBACK.md
Update SUBSCRIBER_STATUS_POSTBACK.md
Update POSTBACK_PASSES.md
Update POSTBACK_MESSAGE_INBOX.md
Update POSTBACK_DELIVERY_REPORTS.md
Update APPENDIX_A.md
Update APPENDIX_B.md
Update APPENDIX_C.md
Update APPENDIX_D.md
Update APPENDIX_E.md
Update addPassData.md
Update createEmailCampaign.md
Update createMMSCampaign.md
Update createUser.md