Add the missing headers

Closes #25
Track specific ITK commit instead of trunk
Open one help window, checkable button

Closes #24
Edit the name in help window

Closes #23
Merge branch 'fix-some-issues'

# By Chrystel Juan
# Via Chrystel Juan
* fix-some-issues:
  Edit the name in help window
  Open one help window, checkable button
  Track specific ITK commit instead of trunk
  Add the missing headers