add gradle support for /library
Merge pull request #141 from felixb/gradle

add gradle support for /library
fixed an issue that caused getHeaderId() to be called more frequently than needed
removed smoothScrollTo* method fixes. They did not work properly and just complicated things. fixes #132
added code to try to fix issue #129 but it fails to fix a similar issue in sample project
Correct button name in README
Fix error in variable name in README
Merge pull request #147 from intrications/patch-1

Correct button & variable name in README