A quick fix to issue #2.
Updated version number to 1.0.9
Corrected (a sort of) a typo.
Use AcroExch.Document\CurVer to locate the ShellEx entry.
Generated installer is in Release directory so that git ignores it.
More on Adobe Reader install check.  Updated distribution READMEs.
Changed the timing of Adobe Reader check.

The check is now done at Welcome.onLeave.
The UI text for the message box (Adobe reader not found)
is updated.
Merge branch 'issue#2'