Changed check_dbname to check_identifier for general identifiers
Implemented get_database_attribute and get_database_resource
Added InvalidRequiredAttributeValueError and ResourceNotFoundError
Updated a few docstrings
Changed no_base_node default parameter value for dict to be True
Updated something somehow
Implemented get_database_attribute and get_database_resource functions
to handle dictionary GET requests
Created some HTTP wrapper methods for common dictlib calls