build: Reorder AutoConf directives to avoid build failures

- Using AC_CONFIG_AUX_DIR([build-aux]) too late results in docs/reference/*
  not finding install-sh which is in $top_srcdir/build-aux
- Using AC_USE_SYSTEM_EXTENSIONS too late results in warnings about using
  AC_RUN_IF_ELSE (and others) before AC_USE_SYSTEM_EXTENSIONS

Now build and make install works without warnings
build: Updated official website in AC_INIT
libtracker-data: Fixed unit tests so files are not left around failing distcheck
Release 1.1.2