Fix dropbox implementation
Fix dropbox implementation

Getting the children node for files breaks. Calling "new jsDAV_Dropbox_file()" causes "object is not a function". Changed to use ".new" instead.
9590/jsDAV,clochix/jsDAV,mnutt/jsDAV,jsilvestre/jsDAV,cozy/jsDAV,arcana261/jsDAV,mnutt/jsDAV,cozy/jsDAV,mikedeboer/jsDAV,WigWagCo/jsDAV,clochix/jsDAV,arcana261/jsDAV,mikedeboer/jsDAV,jsilvestre/jsDAV,WigWagCo/jsDAV,9590/jsDAV