use ImageView instead of TextView when ActionItem have no title

move aboutlibraries.xml to correct location and mark as public resource

use ButterKnife in sample module

Can set default color and default text color (piruin#2)

Thank

Version 1.0.1 - Improve sample code + add Apache License 2.0

Version 1.0.0

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Fix bugs and add some new improvements. See readme file for more information