Refactor out a useless method
config.ref should access the same as config.branch
Merge pull request #117 from engineyard/config-ref

config.ref
Reduce ruby object allocation by 3x

Also starts displaying timestamps on most lines because it saves a few
objects (and uses objects that are already created and are useful)

Running the first spec in rails31_deploy_spec.rb and watching memory
allocation from CLI.start.

On master:
```
Total allocated 17185
Total retained 269

allocated memory by gem
-----------------------------------
2.1.2/lib x 718600
engineyard-serverside/lib x 701369
other x 23225
rubygems x 658

allocated objects by gem
-----------------------------------
2.1.2/lib x 12344
engineyard-serverside/lib x 4320
other x 511
rubygems x 10
```

With these changes:
```
Total allocated 5684
Total retained 274

allocated memory by gem
-----------------------------------
engineyard-serverside/lib x 714169
2.1.2/lib x 103434
other x 23063
rubygems x 658

allocated objects by gem
-----------------------------------
engineyard-serverside/lib x 4160
2.1.2/lib x 1007
other x 507
rubygems x 10
```