remove the ptr tip
remove unused mContext
Post list: add refresh button in collapsed action bar
Prepare use a broacasted refresh event
fix #1321
fix #1320: onPostClicked can be called from a separate thread,
this thread can run after the activity onStop() and in this case,
commiting the fragment will crash the app.

Replacing a call to `commit()` by a call to `commitAllowingStateLoss()` in
this particular case, will avoid a crash but also lose the fragment state:
the selected comment or post won't be recreated.
Revert "fix #1321"

This reverts commit 6576d7f623a972f9c6979691f0bcc44af52dc240.
Revert "fix #1320: onPostClicked can be called from a separate thread,"

This reverts commit 19732b4aab3fe83d99805e75b70488dc836f824d.
add refresh button in most menus
broadcast refresh action
add PullToRefreshHelper register/unregister in all activities/fragment that could be refreshed
show a toast with a tip message when the refresh button is used 1/5/10/... times
change frequency data structure from list to set
Otto test to broadcat the refresh event
Revert "Otto test to broadcat the refresh event"

This reverts commit 48bf0ad73e82ce5433af2a574e42a2e01cd7ba78.
use an activity weak reference in PullToRefreshHelper
move register/unregisterReceiver to onViewCreated/onDestroyView in fragments
Merge branch 'develop' into issue/1332-remove-ptr-tip
Merge branch 'develop' into issue/1332-remove-ptr-tip
Merge branch 'issue/1332-remove-ptr-tip' of github.com:wordpress-mobile/WordPress-Android into issue/1332-remove-ptr-tip