Rename Index into History

- changes in privly-chrome for renaming Index into History
- changed Chrome context menu:
   'Privly Content Extension' -> 'Privly', 
   'ZeroBin' -> 'New encrypted message - ZeroBin', 
   'PlainPost' -> 'New unencrypted message - PlainPost', 
Have you researched the implications of changing this for the Google play store? I am concerned that we won't be able to publish to the same distribution if we change the name.