fix #230
improve rotation handling. fix rotation collection view layout bugs. ref: #36. fix #232.
fix #252
fix #252
fix keyboard issues with rotation and panning. fix #232. close #36. cc: #172
fix #252
update pod spec
Merge branch 'version_5_release' into version_5_ac

* version_5_release:
  update pod spec
  fix #252
  fix keyboard issues with rotation and panning. fix #232. close #36. cc: #172
  fix #252
  fix #252
  improve rotation handling. fix rotation collection view layout bugs. ref: #36. fix #232.
  fix #230