Fix issue #1257
Merge pull request #1262 from hurtonm/master

Fix issue #1257
Add manual control over subscriptions to Pub
xpub welcome msg
Merge pull request #1267 from somdoron/manual_and_welcome

Manual and welcome
remove debug printf in test_xpub_welcome_msg
Merge pull request #1268 from somdoron/manual_and_welcome

remove debug printf in test_xpub_welcome_msg
documentation for welcome msg and xpub manual
add to authors
Merge pull request #1269 from somdoron/manual_and_welcome

Manual and welcome documentation