Merge pull request #8 from jedisct1/slicing

Slicing syntax was put behind a feature gate
Fixed up tests and docs for latest nightly.
Added command wrappers.
Implemented more convenience commands.
Get rid of dummy selfs.
Added many more commands.
Implemented connection like objects.
Updated readme
Use trait inheritance to make things easier and clearer
Some tiny doc adjustments.
Fixed example.
Improved transaction handling, added more high-level commands.
Added many sorted set commands.
Finished commands for sorted sets and hyperloglog
Inline methods on commands
"I provides" => "It provides" in the README
Merge pull request #12 from ajtulloch/patch-1

"I provides" => "It provides" in the README
Switch to rust-url and added support for password based authentication.

This fixes #11
Updated docs slightly and exported function previously missing.
Refactored tests a bit.