Merge pull request #4349 from cpcloud/add-urlerror-info

DOC: correct release notes version
Merge pull request #4320 from y-p/GH3376

TST: skip some tests if scikits is installed but not scipy GH3376
BLD: Use git describe to generate the version string for dev versions
BLD: Strip leading v in git describe version string
DOC/BUG: fix doc build error because a frame was being redefined
BLD: remove ISRELEASED flag
Merge pull request #4218 from y-p/PR_dev_version_string

BLD: Use 'git describe' to generate the version string for dev versions
Merge pull request #4350 from cpcloud/fixup-indexing-doc-failures

DOC/BUG: fix doc build error because a frame was being redefined
ER:  HDFStore raising an invalid ``TypeError`` rather than ValueError when appending with
     different block ordering (GH4096) related
Merge pull request #4355 from jreback/hdf_order

ER:  HDFStore raising an invalid TypeError rather than ValueError when appending with a diff block ordering (GH4096)
DOC: add #4096 issue to v0.13.0.txt
ENH: allow layout for grouped DataFrame histograms

Also remove the slow decorator for tests that take < 100 ms time
ENH: add integer sheetname support
Merge pull request #4104 from cpcloud/layout-with-by

ENH: allow layout for grouped DataFrame histograms
BUG: period idx str map correctly returns an array of str with object dtype
Merge pull request #4136 from cpcloud/period-index-repr

BUG: period idx str map incorrectly returns a str repr of itself when ind.map(str) is called
Merge pull request #4308 from cpcloud/read-excel-page-number-sheet-name

ENH: add integer sheetname support in read_excel
TST/BUG/CLN: make stata IO tests use temporary files for writing
Merge pull request #4356 from cpcloud/fix-stata-testing

TST/BUG/CLN: make stata IO tests use temporary files for writing
DOC: io.wb example