BUG: Remove __getslice__ override.

__getitem__ handles slices in pandas.
BUG: Fix read_sql() call

Use keywords calling pandas read_sql() as some of the arguments
changed.
BUG: Use _geometry_column_name in to_json()

Fixes a bug in to_json() when the geometry column is not named
'geometry'.
Merge pull request #90 from jwass/pd_master_fixes

Pd master fixes
TST: Update Travis CI pandas test version to 0.13.1
Merge pull request #88 from kjordahl/test/pandas-0.13.1

Update Travis CI pandas test version to 0.13.1
BUG: Align index if set_geometry input is Series

If DataFrame's set_geometry() is called with a Series, align
the index.
BUG: Ensure that long type is always changed to int for Fiona schema (GH#93)
TEST: Test that checks various numpy int types as columns when writing to file
Merge pull request #92 from jwass/set_geometry_align

BUG: Align index if set_geometry input is Series
- use unhexlify to get binary wkb data, the str.decode('hex') does not work
  in Python 3.3
Merge pull request #94 from kjordahl/bug/no-long-type

Always use 'int' in Fiona schema
PY3: Use print_function for reporting in pysal choropleth
PY3: Use six library to import urlopen for 2/3 compatibility
BUG: Fix from_features to align properties

This fixes a longstanding bug starting in read_file() that was migrated to
GeoDataFrame.from_features() which wouldn't align features with their
associated rows.
Merge pull request #95 from kjordahl/bug/unhexify

Use unhexify for python 3 compatibility
Merge pull request #96 from jwass/from_features_fix

BUG: Fix from_features to align properties
BUG: __new__() shouldn't take arguments
PY3: Use explicit list in test
PY3: Use string.ascii_lowercase for compatibility and locale independence