Finish 2.5.0-rc.2
Update composer.json
README: Add warning about urlencoding params
README: Remove accidental heading formatting
Add .gitignore file
Add .gitattributes file

For LF normalization
Add bower.json
Update version to 2.5.0-rc.3-dev
Don't require consumer key if bearer token is set. Fix #57
Add changelog entry for #57
Add note about #57 to readme
Finish 57-no-signing-for-app-only-auth
Fix CI warning about possibly undefined variable
Set version to 2.5.0
Finish 2.5.0