Allow for third argument in file dict value to support explicit
file content type.
Fixing test to ensure it passes with python 3.
Make merge_kwargs case-insensitive when looking up keys.
Retrieve kwargs.keys() just once.
Merge pull request #1091 from vinodc/specify_file_content_type

Allow for explicit file content type support
Merge pull request #1092 from jianlius/case-insensitive-update

Make merge_kwargs case-insensitive when looking up keys.
Merge remote-tracking branch 'origin/master'
+1
remove the TURKTRUST root certificates, as per #1102
Merge pull request #1105 from slingamn/turktrust

refresh CA certificates
Update docs with correct cookie behaviour.
Merge pull request #1107 from Lukasa/master

Correct broken cookies example
Remove support for certifi

As per #1105, certifi is being end-of-lifed. Requests will use either
its own vendored bundle, or possibly (when packaged with OS distributions)
an externally packaged bundle, which can be enabled by patching
requests.certs.where().
Merge pull request #1110 from slingamn/certifi_eol

Remove support for certifi
Fixed proxy requests to pool connections.
Merge pull request #1114 from vlaci/master

Keep-alive support for http proxies
Add py3.3 testing back
Merge pull request #1120 from spulec/patch-2

Add py3.3 testing back
Merge remote-tracking branch 'upstream/master'