PyMemberInfo is generic now
MembersManagers now accepts PyMemberInfo (needed to get abstract and other info) (todo: doc)
Merge remote-tracking branch 'origin/master'

Conflicts:
	python/src/com/jetbrains/python/psi/PyUtil.java
PyArgumentList#addArgument fixed and test added
method to detect that file type was detected from content
treat files with plain text file type that was detected from content as files with unknown file type
PY-2858 Pull Up Abstract Method (finally!)
Merge remote-tracking branch 'origin/master'