Merge tag '1.5.1' into develop

Released v1.5.1.

Changelog available on the website.
Fix: make sure git hf update always returns to the right branch after an update
exported FEATURE_ORIGIN used on git-hf-feature to allow work on forks (features on fork and all the other tags in origin).
Added hubflow_push_latest_changes_to_feature_origin as a replace function for hubflow_push_latest_changes_to_origin function
Added hubflow_fetch_latest_changes_from_feature_origin for being sure that in a feature start we have the last version of our fork
feature pull and feature push now working with featureOrigin and with no need of args (they made push and pull of current branches)
Merge pull request #1 from socialpoint/feature/featureOrigin

Feature/feature origin
Update README.md
Merge pull request #2 from smoya/patch-1

Update README.md
pull and push feature commands now accepts extra parameters (like -f, -v, ...)
Added fork support to hub flow init script.
Updated README with information about how to use fork support
Merge pull request #3 from mperalta/feature/improvements

Improvements in HubFlow fork with forks support
Added direct-release.
It unifies start and finish release steps in just one step. Very useful for releasing content that is tested and stable on develop branches. In this cases there are no need to stop in the middle of the release.
Merge pull request #5 from mperalta/feature/potenzier-release

Added direct-release.
Revert "Added direct-release."

This reverts commit 49426f5214b537d86856e5ca3d31b6a8aceb4851.
Revert "Added fork support to hub flow init script."

This reverts commit f12af8989ff111dece2ba28bf9f18c2a78a16a63.
Revert "Revert "Added fork support to hub flow init script.""

This reverts commit 844beae3b775de568396a7fda9093351d4d1ef3e.
Revert "Revert "Added direct-release.""

This reverts commit d07310459313c0f77bca6bdc40c9447c1e35f610.
direct-release now is completely unattended
Setup tracking config correctly

.. to avoid 'git push' resulting in new remote branch called 'origin'
after 'git hf feature start my-fancy-branch-name-goes-here'
Added flag --noquestions in init hubflow.
Merge as no-edit