add test for unicode multipart post
use compat.str instead of compat.builtin_str
add additional test for unicode multipart post
add a few more variations to the unicode multipart post test
model the encode_files data handling after encode_params
Merge pull request #1279 from jemerick/unicode_multipart_post

Unicode strings in multipart post requests
Fix max_redirects docs issue #1301
Merge pull request #1313 from iurisilvio/fix_max_redirects_docs

Fix max_redirects docs issue #1301
pt
Merge remote-tracking branch 'origin/master'
milla