Reset terminal after composer

Because composer does not clean up after itself
D: Fix DMD binary path on OS X

See travis-ci/travis-ci#3033.
Merge pull request #358 from klickverbot/dmd-osx-path

D: Fix DMD binary path on OS X
C#: change keyserver to keyserver.ubuntu.com

The pgp.mit.edu server seems pretty unreliable lately, e.g. it failed on [this](https://travis-ci.org/gnome-do/core/builds/44062038#L84) and [this](https://travis-ci.org/akoeplinger/omnisharp-roslyn/builds/44084881#L84) build.

I've heard that the Ubuntu keyserver should be more reliable.
Updated tests
Split disable-sudo message into two lines
Merge branch 'master' of github.com:travis-ci/travis-build
Split disable-sudo message into two strings

So that they both appear in yellow
Merge pull request #359 from akoeplinger/patch-1

C#: change keyserver to keyserver.ubuntu.com
C#: install PCL reference assemblies package

This is required to build portable class libraries.
Update tests
Merge pull request #361 from akoeplinger/patch-1

C#: install PCL reference assemblies package
Bypass rbx dependency install checks

This fixes https://github.com/travis-ci/travis-ci/issues/3056
Merge pull request #362 from travis-ci/ha-bug-rbx-on-container

Bypass rbx dependency install checks
Added JWT addon