upgrade to riak python client 2.x
ignore errors while symlinking single color tiles
upgrade riak version for travis
remove riak prefix, allow alter port numbers, update documentation
extend riak cache configuration to support multi node connections
fixed missing import of RiakObject and riak package warning
update spec as described in documentation
fixed setting default ports; make code more idiomatic
extend docs; use space instead of tabs
Merge pull request #112 from olt/riak-client-2.x

Riak client 2.x
update CHANGES for 1.6.0
bump version for next release
fixed camel-casing of MapProxy in --version
document WSGIPythonPath/WSGIPythonHome
fixed typo in error message
handle loading of empty tiles set from mbtiles
raise error when querying for more than 333 tiles
free image on close_buffers to reduce memory on large requests
document max_tile_limit
use srs_code in WMS-C capabilities instead of TMS srs_name