Added Changes section and related text (closes #116)

Please note that tidy cleaned up some recent commits.
Merge pull request #117 from marcoscaceres/changlog

Added Changes section and related text (closes #116)
tidy up merge
Moved TelephonyCall outside CallHandler
Set publication date to the 20th
regenerated doc
Merge pull request #130 from marcoscaceres/small_fixes

Merged in markup fixes from sunday, update pub date to 20th, clean up.