ENH: unify the replace API

[cpcloud]

Currently DataFrame and Series do slightly different things when their respective replace methods are called and accept slightly different arguments. This should be rectified in 0.13.

[jreback]

I believe this is closable now.... after #3482 maybe need to add some more tests though?

[cpcloud]

yep i think some regex tests are in order....might be a little while before i can get to them tho

[jreback]

maybe should move tests like this to tests/test_generic.py? ?

[cpcloud]

yep and probably any tests that fit that bill (no idea how many that is....)

[jreback]

let me add that to post series2

[jreback]

FYI I created tests/test_generic.py for at some point add these tests

[cpcloud]

nice

[jreback]

I think this is closed? @cpcloud

[cpcloud]

everything except for equivalent tests, but those are in #4324