pytransitions / transitions / 587

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Pull #239

travis-ci

Better rep function for callables

As discussed in #239:
 - `rep()` is now a free function
 - `rep()` pretty-prints partial functions
 - `rep()` calls `str()` on its argument when everything else fails

Also, the following cases are now tested:
 - `rep()` with a string argument returns the string
 - `rep()` with a function returns the name of the function
 - `rep()` with a partial function returns name + args + kwargs
 - `rep()` with anything else calls `str()`

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