Added LegacyToken property to use as an alternative to the UseLegacyToken(string) method.  This should make it easier to use with Dependency Injection frameworks like Spring.
Added LegacyToken property to use as an alternative to the
UseLegacyToken(string) method.  This should make it easier
to use with Dependency Injection frameworks like Spring.

repl-richard-huska/freshbooks-api,Abhirafuru/freshbooks-api,parmarnishant/freshbooks-api,brianbredenkamp/freshbooks-api,darioxtx/freshbooks-api