to_gtk2.22 : remove gtk < 2.6 check and support
to_gtk2.22 : remove gtk < 2.10 check and support
to_gtk2.22 : remove eggtrayiron used in gtk < 2.10
to_gtk2.22 : remove gtk < 2.14 check and support
to_gtk2.22 : remove gtk < 2.22 check and support
to_gtk2.22 : check gtk >= 2.22 in configure time
Merge remote-tracking branch 'pcman-bbs/no2.22'

* pcman-bbs/no2.22:
  to_gtk2.22 : check gtk >= 2.22 in configure time
  to_gtk2.22 : remove gtk < 2.22 check and support
  to_gtk2.22 : remove gtk < 2.14 check and support
  to_gtk2.22 : remove eggtrayiron used in gtk < 2.10
  to_gtk2.22 : remove gtk < 2.10 check and support
  to_gtk2.22 : remove gtk < 2.6 check and support
Use --disable-silent-rules in travis-ci
Use -Wall -Werror in travis-ci
warning: initialization order
warning: signed / unsigned comparison
warning: missing return
warning: unused variables
warning: const-correctness