BUG: don't allow an empty dataframe to have scalar assignment succeed (GH5744)
API/REGRESS: partial revert of f8b6208675b5b10d73a74f50478fa5e37b43fc02
     allow assignment of a column in a frame with a scalar with no index (so adds to the columns),
     instead of raising; this preservers 0.12 behavior
DOC: added missing argument in Series.apply
DOC: io.rst top-level can now click on read/write methods to acess the appropriate sections

DOC: cleaned v0.13.txt
ENH: set display.max_seq_items default != None
BUG: construction of DataFrame from empty Series regression (GH5756)
BUG: Row-wise concat of differeing dtypes failing in certain cases (GH5754)
API: Series.ravel compat with ndarray
DOC: remove travis mentions in CONTRIBUTING.md. It just works now.