BLD: fix cythonized msgpack extension in setup.py GH5831
Add pandas cookbook to tutorials (for #5837)
BLD: enhancements to print_versions.py
DOC: updated compare w r
BLD: make util/print_versions.py standlone as well
Merge pull request #5866 from chappers/r-compare

DOC: Flesh out the R comparison section of docs (GH3980)
Merge pull request #5842 from jvns/patch-1

Add pandas cookbook to tutorials (for #5837)
BLD/DOC: explain how to print_versions() sans repo in CONTRIBUTING.md
DOC: tweaks to CONTRIBUTING.md
DOC: show the Panel.reindex API change in v0.13.0.txt (GH5867)
BLD: fixup setup.py, initialize pipe variable to None
Merge pull request #5868 from y-p/PR_setup_pipe

BLD: fixup setup.py, initialize pipe variable to None
BUG: Bug in groupby dtype conversion with datetimelike (GH5869)
Merge pull request #5870 from jreback/groupby_ts

BUG: Bug in groupby dtype conversion with datetimelike (GH5869)
BLD: python3 unicode issue in print_versions
BUG: Regresssion in handling of empty Series as indexers to Series  (GH5877)
Merge pull request #5880 from jreback/series_empty

BUG: Regresssion in handling of empty Series as indexers to Series  (GH5877)
DOC: Add two examples to to_datetime
Merge pull request #5887 from jseabold/to-datetime-example

DOC: Add two examples to to_datetime
BLD: Send Travi-CI results to ScatterCI