Merge branch 'mc/push-recurse-submodules-config'

Add new config to avoid typing "--recurse-submodules" on each push.

* mc/push-recurse-submodules-config:
push: follow the "last one wins" convention for --recurse-submodules
push: test that --recurse-submodules on command line overrides config
push: add recurseSubmodules config option

diff --cc Documentation/config.txt
Simple merge