Changes in 0.2.1

* Fixed #476315 - Anjuta set _LDADD for shared object
* Fixed #475280 - _HEADERS not defined
* Added support for SRC_SUBDIRS like it's used in gtk+
* Add support for check_PROGRAM (bug #474617)
* Improve gnome-build EXTRA_DIST support (bug #463408)
* Added localisation through gettext()
* Migrated to use po/LINGUAS
* Changed variable detection rule to also match ${VAR} (bug #450604)
* Removed check_LTLIBRARIES restriction, added expanding vars in
  SUBDIRS (bug #450604)
* Append data to a macro rather than overwrite it if an assignment
  is split into several lines (#510351)