Here is a list of all files with brief descriptions:

ConsumerNonce.php
ContentItem.php
ContentItemImage.php
ContentItemPlacement.php
Context.php
DataConnector.php
DataConnector_mysql.php
DataConnector_pdo.php
DataConnector_pdo_sqlite.php
HTTPMessage.php
Item.php
Membership.php
Profile/Message.php
ToolProvider/MediaType/Message.php
OAuthConsumer.php
OAuth/OAuthDataStore.php
ToolProvider/OAuthDataStore.php
OAuthException.php
OAuthRequest.php
OAuthServer.php
OAuthSignatureMethod.php
OAuthSignatureMethod_HMAC_SHA1.php
OAuthSignatureMethod_HMAC_SHA256.php
OAuthToken.php
OAuthUtil.php
Outcome.php
Profile/ResourceHandler.php
ToolProvider/MediaType/ResourceHandler.php
ResourceLink.php
ResourceLinkShare.php
ResourceLinkShareKey.php
SecurityContract.php
Service.php
ServiceDefinition.php
ToolConsumer.php
ToolProfile.php
ToolProvider.php
MediaType/ToolProxy.php
ToolProxy.php
ToolSettings.php
User.php