Allow to configure same parameter differently for different goals

[aleksandr-m]

E.g. set fetchRemote for release-start to true and false for feature-start.

See #23 and #32.

[fliu721]

I think there is two way to fix this.

1. Change property name in different goal. e.g. pushRemote in hotfix-finish goal change to pushRemoteHotfixFinish.

2. Change property type from Boolean to String, property value is a comma-separated goal name string. e.g. If property pushRemote value is hotfix-start,hotfix-finish means hotfix-start and hotfix-finish goal need to push to remote and other goal not in this string will not push remote.

And I commit a pull request with the first solution.
What do you think about this?