CLN: remove try suite in _read

A skip will now occur if a call to urlopen or a read from the resulting object
throws a urllib2.URLError exception
TST: skip some tests if scikits is installed but not scipy GH3376
DOC/CLN move isin to 0.13 release note
DOC: add v0.13.0.txt to the index.rst (closes GH4288)
Merge pull request #4305 from cpcloud/add-urlerror-info

CLN: let URLError fall through in pandas.io.html._read
DOC: correct release notes version
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