Change references for 1.3.x to 1.4

This updates the documentation headers and other various places in the docs
where we are referencing 1.3.x and should now be referencing 1.4 pending the
future release.

Signed-off-by: Ken Barber <ken@bob.sh>
Release notes for 1.4.0

Signed-off-by: Ken Barber <ken@bob.sh>
Add last name for Chuck to release notes

Signed-off-by: Ken Barber <ken@bob.sh>
Corrections to release notes from review

Signed-off-by: Ken Barber <ken@bob.sh>
Merge pull request #594 from kbarber/release_140

Release 1.4.0
Merge branch '1.4.x'

* 1.4.x:
  Corrections to release notes from review
  Add last name for Chuck to release notes
  Release notes for 1.4.0
  Change references for 1.3.x to 1.4