Added httpMethod for upload (defaults to POST)

Provide httpMethod option to FileTransfer.upload 

(supplied as an argument.)

Use in conjunction with update to js (submitting a pull request too.)

iOS patch submitted today also.

see issue:

https://issues.apache.org/jira/browse/CB-51?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13609481#comment-13609481