geocoding fails with unicode input

[perrygeo]

continuation of mapbox/mapbox-sdk-py#110

The problem is in the CLI. Using the python SDK gives be similar results to the bites

>>> import mapbox
>>> result = mapbox.Geocoder().forward("Florianópolis, Brazil").json()
>>> for x in result['features']:
...     print x['text']
Florianópolis
Jardim Florianópolis
Rua Florianopólis
Rua Florianópolis
Rua Florianopolis

But using the CLI, I get an error

$ mapbox geocoding "Florianópolis, Brazil"
/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib.py:1303: UnicodeWarning: Unicode equal comparison failed to convert both arguments to Unicode - interpreting them as being unequal
  return ''.join(map(quoter, s))
Traceback (most recent call last):
  File "/Users/mperry/env/mapbox/bin/mapbox", line 9, in <module>
    load_entry_point('mapboxcli==0.2.0', 'console_scripts', 'mapbox')()
  File "/Users/mperry/env/mapbox/lib/python2.7/site-packages/click/core.py", line 716, in __call__
    return self.main(*args, **kwargs)
  File "/Users/mperry/env/mapbox/lib/python2.7/site-packages/click/core.py", line 696, in main
    rv = self.invoke(ctx)
  File "/Users/mperry/env/mapbox/lib/python2.7/site-packages/click/core.py", line 1060, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/Users/mperry/env/mapbox/lib/python2.7/site-packages/click/core.py", line 889, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/Users/mperry/env/mapbox/lib/python2.7/site-packages/click/core.py", line 534, in invoke
    return callback(*args, **kwargs)
  File "/Users/mperry/env/mapbox/lib/python2.7/site-packages/click/decorators.py", line 17, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "/Users/mperry/work/mapbox-cli-py/mapboxcli/scripts/geocoding.py", line 101, in geocoding
    q, types=place_type, lat=lat, lon=lon, country=country)
  File "/Users/mperry/work/mapbox-sdk-py/mapbox/services/geocoding.py", line 51, in forward
    dataset=self.name, query=address)
  File "/Users/mperry/env/mapbox/lib/python2.7/site-packages/uritemplate/template.py", line 127, in expand
    return self._expand(var_dict, False)
  File "/Users/mperry/env/mapbox/lib/python2.7/site-packages/uritemplate/template.py", line 89, in _expand
    expanded.update(v.expand(expansion))
  File "/Users/mperry/env/mapbox/lib/python2.7/site-packages/uritemplate/variable.py", line 333, in expand
    expanded = expansion(name, value, opts['explode'], opts['prefix'])
  File "/Users/mperry/env/mapbox/lib/python2.7/site-packages/uritemplate/variable.py", line 284, in _string_expansion
    return quote(value, self.safe)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib.py", line 1303, in quote
    return ''.join(map(quoter, s))
KeyError: u'\xf3'

Failing test case pushed to the geounicode branch.

/cc @ingalls @sgillies

[perrygeo]

Not surprisingly, Python 3 handles it just fine.

[perrygeo]

So the CLI does the right think thanks to click - all inputs are decoded to strings (in python3) or unicode (in Python 2). But the sdk needs to encode them as utf-8 to construct URIs. So we handle it there...