Latest LTS, bash fix, slave port fix and community changes
updated to clean up correctly, use volumes and docs
Add many redis versions
version pinned correctly

Version is now pinned corectly in apt-get, and other efficiently improvements by @tianon.
Update golang (especially to include new/better tags and to re-include `make`)
Merge pull request #227 from infosiftr/golang

Update golang (especially to include new/better tags and to re-include `make`)
Add support for direct building of a URL

This allows for things like: (to build test a PR branch directly)
```console
$ ./build.sh https://raw.githubusercontent.com/infosiftr/stackbrew/redis/library/redis
```

Or: (to build test just one tag of a PR branch)
```console
$ ./build.sh https://raw.githubusercontent.com/infosiftr/stackbrew/redis/library/redis:2.6
```
Merge pull request #229 from infosiftr/build-url

Add support for direct building of a URL
Merge pull request #224 from infosiftr/redis

Add many redis versions
Merge pull request #216 from michaelneale/master

Latest LTS, bash fix, slave port fix and community changes