Clarify we are using the "client ID" and "secret", the phrases used on the Mendeley temporary OAuth 2.0 app management page
Also fix wording in Mac OS X sample app
Merge pull request #17 from thirdiron/clarifyWordingInSetup

Clarify Mendeley OAuth 2.0 terminology in setup
Clarify OAuth 2.0 terminology
Clarify OAuth 2.0 terminology
Clarify OAuth 2.0 terminology
Clarify OAuth 2.0 terminology