changed Parameter type from String to CharSequence

No need to use String here, with using CharSequence one can add html characters in the title.
detach hard dependency to v19.0.0 of support lib

When this is uploaded to mavenCentral or mavenLocal, the users should be able to use
whatever support library he is using with his project and not forced by this library
to use specifically "19.0.0" for his whole project.
Merge pull-request #57 'stonecs/master'

https://github.com/astuetz/PagerSlidingTabStrip/pull/57
Merge pull-request #70 'championswimmer/patch-1'

https://github.com/astuetz/PagerSlidingTabStrip/pull/70