Add multipart form support. Does not yet handle additional post parameters correctly.
Add support for OAuth-signed parameters when using multipart POST
Update tests to use multipart upload
Expand "~" to home path
Add file upload support to the commandline, using the same technique as openphoto-php
Merge branch 'master' into multipart

Conflicts:
	tests/test_base.py
Merge pull request #19 from sneakypete81/multipart

Multipart Form Upload Support