port api3's upload workflow

better fix for weird parameter bug

fix bad parameter inconsistency in signing process

Update readme.textile

Update readme.textile

Update readme.textile

Update readme to link to new api lib

Do not include null parameters. Fixes #2

use regular php tags

fix http_build_query calls for php 5.3

use chunk_temp_dir variable properly

add replace video for upload api

update changelog and readme

fix params for uploadMulti()

update to new upload method