Fix Issue 1422 - add help text to repl and uberjar tasks documenting imp...

...licit profile application

Added the following text to both `repl` and `uberjar` docstrings:

    Note: the default profiles (`:dev`, `:provided`, `:user`, `:system`, and `:base`) 
    profiles are activated for this task.  Type 'lein help profiles' for more information.