Excluded all non "oauth_" parameters from the signature for multipart requests.

Discovered issue when attempting to post to Twitter with media attached.
Per Twitter docs (https://dev.twitter.com/docs/uploading-media) oauth
should be handled differently in this scenario.
Revert "Excluded all non "oauth_" parameters from the signature for multipart requests."

This reverts commit 178ad4d8821ad8b2b51019acee613180a1c8ac4f.
Excluded all non "oauth_" parameters from the signature for multipart requests.

Redid previous commit to omit log files that were included accidentally.

Also (hopefully?) fixed formatting.
Merge pull request #488 from esthereisner/master

Excluded all non "oauth_" parameters from the signature for multipart re...