BLD: don't link against math library on windows
BUG: repr fix for all-NA index level. close #1971
DOC: add a few more notes on bug fixes in release.rst
DOC: missed a few for release notes 0.9
DOC: release notes, bump to RC2
DOC: fix up build errors in release notes
non-ascii bytes in "str" type are ambiguous.

Since the codepoints resulting from a decode depend on the encoding,
this test can only be an example of error handling, but the current code
doesn't treat it as as such. so IMHO this is wrong,  it breaks
another fix which I believe does the right thing in this respect,
for another issue. and so It is removed by this patch.
Unicode<-> bytes conversion and coercing should be done at I/O
entry points, not internal code.
modify _check_method_works to test index with unicode
BUG: #1982 fix index.summary() to handle unicode in indices

internal representations should be unicode objects, not
strings, conversion should be at I/O contact-points only.

Note: this still does not address the problem of pprinting
indices that have a tuple of unicode strings, as a value.
This issue came up before, monkey-patched in f4e3ab6b922d69,
but second time around - a more general solution is needed.
Break console_encode again.
Add testing helpers for mocking and encoding tests.

pandas.util.testing now has a SimpleMock class for mocking objects which
have read-only attributes.
Ths mocking support is used by the *stdin_encoding* context manager to
make it easy to test code with an arbitrary value for sys.stdin.encoding.
Add test to catch broken console_encode()
re-introduce fix for console_encode()
BLD: link against m library in sparse ext too #1955
BUG/ENH: treat NA as additional group in merge operations. close #1990
BUG: work around NumPy unsafe object->int casting. close #1987
BUG: fix drop_duplicates for tuple column label
TST: io.parsers._read should accept unicode urls

_read() is finicky about it's parameters, so tested indirectly
via read_csv
BUG: _read should accept any basestring
TST: tseries.converter.time2num should accept basestring,not str