BUG: Various issues with maybe_convert_objects (GH #2845)
BUG: Another issue with maybe_convert_objects (GH #2845)
TST: Corner case tests for maybe_convert_objects (GH #2845)
Merge pull request #2846 from stephenwlin/fix-maybe-convert-objects

BUG: Various issues with maybe_convert_objects (GH #2845)
thanks!
Merge branch 'dtypes_bug' of https://github.com/jreback/pandas into jreback-dtypes_bug

Conflicts:
	pandas/tests/test_frame.py
BUG: fix sparse_frame printing (bug introduced in dtypes)
     MockBlockManager didn't support blocks method
TST: added tests for GH #2837
BUG: removed use of Counter (breaks 2.6), replace with defaultdict
     in get_dtype_counts