added read_sourceconfiguration function
made read_sourceconfiguration() and get_section() static
made sourceloader use static Configurator methods
added function descriptions of read_sourceonfiguration and get_section
the difference between class and object variables...
removed test for existence of reliability in config from chemspider init
removed test for existence of reliability in config from NIST init
removed test for existence of reliability in config from WikipediaParser init