Adding support for neutral button.

Fixing formatting.

Fixing formatting. Again.
Merge branch 'master' of https://github.com/inmite/android-styled-dialogs

Conflicts:
	library/src/main/java/eu/inmite/android/lib/dialogs/SimpleDialogFragment.java
Making field final.
Merge pull request #53 from arriolac/master

Adding support for neutral button.