20180906 Add '-r' option, to specify the maximum time a sequence will be submited, to handle TimeOutException.
0.0.11
20180713 Add '-n' option, users can specify how many top-hits to be output.
0.0.8
20180711 Using logging module, and specify whether one sequence gets no result because of TimeOutException.
0.0.7
20180710 do not capture too exactly, to the 'td' level is fine, but do not capture 'h' or 'em' level. Because BOLD result page won't have 'h' or 'em' item when the result is empty.