jshint
getFileExtension func  , getFileKey func
multipart_params_obj define in directUpload func
update the http request url
Merge remote-tracking branch 'origin/master' into 7481_add_key_handler
remove comment and other
add a func named reset_chunk_size
get key_handler form op
add try-catch when parseJSON in service 614 becasue of json format is not always same
asyc qiniu.js in src folder
update useage
URLSafeBase64Encode key when uploaded a file
unique_names_postfix -> unique_names
file -> file.name
get key handler from op.init
update the usage of sdk
KeyHandler -> Key
usage in main.js update
update the demo code in index.html
sync qiniu.js in src folder