Add Ant dependency

When trying to run `bundle exec redstorm install` I got this error:

```
error: unable to load Ant, make sure Ant is installed, in your PATH and $ANT_HOME is defined properly

error details:
Cannot run program "ant" (in directory "/Users/moss/code/redstorm-starter"): error=2, No such file or directory
```
Merge pull request #1 from benmoss/patch-1

Add Ant dependency