Config Engine unit tests for security token option #36
Token - allow variable length
Token - tests for validation #36
Tokens - move 'token' to @config_opts, together with key and secret #36
Tokens  - updated README #36
Revert "Tokens - move 'token' to @config_opts, together with key and secret #36"

This reverts commit dcbb4d2d9ff8d7519fe0e976ceed8f2c3d3c92d7.
Version 0.957beta released