Move OAuth 1.0 sources to include/oauth and src/oauth folders
Fix indentation in ServiceConfiguration.h
Rename oauth folder to oauth1. Replace namespace OAuth with OAuth1

Move some files to the root of source and include folders.
Move OAuth 1.0 tests to test/oauth1 folder
Include missing header SingleLevelJSONTests.h
Merge pull request #33 from Melzas/separate-oauth-sources

Move OAuth 1.0 sources to a separate folder