Feature/calls in dot forms

[allison-casey]

closes #1108

This allows expressions in the attribute access macro . that compile to method calls, such that the following is now possible

=> (. os (getcwd) (isalpha) __class__ __name__ [0])
os.getcwd().isalpha().__class__.__name__[0]
'b'
=> (. "ab hello" (strip "ab ") (upper))
"ab hello".strip("ab ").upper()
"HELLO"

[Kodiologist]

Looks good, but why the extra newline in test-attribute-access?

[allison-casey]

fixed

[scauligi]

Dope!
It looks like we're explicitly blocking unpack-* forms, but what about other specially-parsed forms like quote or annotate? (Should we do something about them explicitly?)

=> (. x ^y)
x.annotate(y)

=> (. x 'y)
x.quote(y)

[Kodiologist]

While funny, that sort of behavior is probably not worth trying to prevent.