Feedback: haystack installation in tutorial

[PhilipMay]

In Tutorial3_Basic_QA_Pipeline_without_Elasticsearch you say to install haystack with:
! pip install git+git://github.com/deepset-ai/haystack.git@ef9e4f4467a2e265bad72b048a1a3186e40969b1

I suggest to change that to:
! pip install git+https://github.com/deepset-ai/haystack.git@ef9e4f4467a2e265bad72b048a1a3186e40969b1

On some environments (like our corporate ML server) only http and https is working to connect to the outside...

Even better would be to say:
! pip install git+https://github.com/deepset-ai/haystack.git
Without the suffix. With adding a suffix you basicaly say "hey our master branch is not always clean" - which is bad.

PS: Please also check the other tutorial versions...

[tholor]

Thanks for the feedback.
We used the install from a specific commit in the early phase of the project to speed up development a bit while ensuring functional tutorials.
I agree that this is not nice and can create confusion.

Changed it in #200 to install from latest master via https.
In future, we might switch this to the latest PyPi release and get completely rid of the "git installation".