Log Message:
ibus-chewing: Update to 1.5.1

Changelog:
PRJ_VER=1.5.1
SUMMARY=Fix the Ctrl, Numpad and selection keys handling
REDHAT_BUGZILLA=1337185
[Changes]
- Enhancement:
- Fix:
  + GH issue #73: Ctrl, Alt, Ins causes the pre-edit duplicate commit
  + GH issue #74: Failed to clean the PreEdit when changing input focus
  + GH issue #79: Failed to input space when "space-as-selection"
  + GH issue #87 Modify dropdown menu for selecting keys
  + GH issue #88 Numpad should be able to select
  + RHBZ #1337185 - Cannot add phrases with Ctrl
    A.k.a GH issue #63
    Thank for contribution from hiunnhue
- Acknowledge:
  + Obata Akio contributed pull request 71, 72, 73
  + hiunnhue contributed pull request 75, 76, 77, 78, 80, 81, 82, 83, 84, 86,
    87, 90, 91, 92, 94
  + hiunnhue fixed issue 73, 74, 79, 87, 88, 90, 91, 92, 94