tweak description about templates list in "motion create --help"
tweak description about templates list in "motion create --help"

The description of all templates on one line does not have readability.

This patch will show the templates on each line, like
```
      Create a new RubyMotion project from one of the following templates:
        * android
        * gem
        * ios (default)
        * ios-action-extension
...
```

hboon/RubyMotion,katsuyoshi/RubyMotion,hboon/RubyMotion,HipByte/RubyMotion,hboon/RubyMotion,HipByte/RubyMotion,katsuyoshi/RubyMotion,HipByte/RubyMotion,katsuyoshi/RubyMotion,katsuyoshi/RubyMotion