BUG: Series.map fails when mapping a dict with tuple keys

Explicitly use keys as index to prevent conversion to MultiIndex

Add test for mapping with tuple-keyed dict

Specify expected output for the test and use assert_series_equal

Add note to v0.14.1 release notes
Merge branch 'tuple-fix' of https://github.com/onesandzeroes/pandas into onesandzeroes-tuple-fix

Conflicts:
	doc/source/v0.14.1.txt