removed ijson and implemented a simple iteration parsing(break lines)

benchmarks with ijson, result to be slow
updated readme, we don't use ijson anymore
don't use netrc in requests it's slow
remove ijson from setup.py
fix tests with auth, requests need a tuple not a list
remove unused ijson import from client
try to use simplejson first it's faster than stdlib json
add caching of get_doc using etags and lru
use bigger chunk_size in line iteration of changes