Add a simple count test
Abstract redis client

As this commit, only 2 redis client connections should be active.

One for the SRC and now ./redisClient.js
counts

- use a prefix
- in test, convert to Number type
make incrUrl function

The incrUrl should be called on a positive node activity detected
regardles of cache hits/misses.
Up the count requests
Add test for /counts without a url query string
Update API
Check for the prefix not in GET:/count:url
Use eachSeries

When the count was 0, it seem to just hang?
Appy anti prefix to GET /counts
Merge branch 'wlaurance/feature/get-counts' into develop

Fixes #17
0.0.4