Merge pull request #316 in ZP/z-push from feature/ZP-998-implement-script-that-synchronizes to develop

* commit '30179b03': (23 commits)
  ZP-998 Gab2Contacts depends on z-push-common.
  ZP-1120 Link z-push-gab2contacts in /usr/sbin.
  ZP-1084 Rewrite Z-Push path for gab2contacts in rpm packages.
  ZP-1084 Sed needs to make an inline copy of the file instead of redirecting the output.
  ZP-1084 Set z-push path in gab2contacts script.
  ZP-1084 Make gab2contacts executable.
  ZP-1084 Create dir and exclude gab2contacts.
  ZP-1084 Introducing z-push-kopano-gab2contacts.
  ZP-1083 Fixed file encoding.
  ZP-1083 Updates headers and LICENSE, added TRADEMARKS (as ZP-1085).
  ZP-1083 Check if defines are defined before defining, request PR_EC_AB_HIDDEN from addressbook and ignore entry if it's set (as ZP-916).
  ZP-1083 Fixed sending error message to STD_ERROR and exiting with 1 (as ZP-1022).
  ZP-1083 Fixed sending error message to STD_ERROR and exiting with 1.
  ZP-998 Fixed example configurations strings.
  ZP-998 Removed space.
  ZP-998 Use elseif to be 0.0000001% faster.
  ZP-998 Remove unused $store in getExistingContacts().
  ZP-998 The custom hash property should live in the contact/address realm.
  ZP-998 Fixed names.
  ZP-998 Protected methods should start with a lowercase letter.
  ...