update, add RE exception, update use argpaese library.
update doc, ver4.2
update README
update, remove 'exit()'
update dev_document
add windows support

replace all '\\'  to '/'
add '\' directory split symbol support.
replace r'\' to '/' for support windows
cache test print
merge
update Processor
add RE log output
add Download end info
add multiple thread download file
Update README
merge with master