CLI - Make kamel run handle github urls that are not raw

[lburgazzoli]

Fixes #1497

Release Note

It is now possible to run integrations from GitHub with a dedicated URL
syntax:

    kamel run github:$user/$repo/$path?branch=$branch


As example, running the following command

    kamel run github:apache/camel-k/examples/Sample.java

is equivalent to:

    kamel run https://raw.githubusercontent.com/apache/camel-k/master/examples/Sample.java

but does not require to type the full GitHub RAW URL.

Declaring the branch query param is not required and defaults to `master` if not
explicit set.

[lburgazzoli]

/cc @davsclaus

[oscerd]

Wonderful

[davsclaus]

awesome lovely work

[lburgazzoli]

looks like the travis-ci check is not updated as the related jobs did succeed, see https://travis-ci.org/github/apache/camel-k/builds/696845748

@nicolaferraro shall we merge this ?

[nicolaferraro]

looks like the travis-ci check is not updated as the related jobs did succeed, see https://travis-ci.org/github/apache/camel-k/builds/696845748

@nicolaferraro shall we merge this ?

Yes, notifications are not working properly recently.