move BuildUtils to WPUtils subtree, rename BuildUtils to PackageUtils and add getPackageInfo and getVersionCode methods
remove unused method from ProfilingUtils
remove ProfilingUtils.getVersionName calls
Merge pull request #1764 from wordpress-mobile/issue/1713-send-version-code-to-mixpanel

fix #1713 send version code to mixpanel
move NetworkUtils to WPUtils subtree
add a network mode in PullToRefreshHeaderTransformer to show a different message when network is disabled
remove unused code
set network refresh mode as default
use the PTR library version 0.9.7
disable refresh on the attacher