Reference newest erdpy

• Reference newest erdpy.

Latest erdpy, minor fixes

• Update reference to erdpy, fix some linting warnings
• Fix listing of templates
• Ask precise version of erdpy deps to install.

New erdpy, fixes

• Reference new erdpy
• Handle elrond.json project files with missing language.

Fixes

• Pass CONTRACT_FOLDER as env variable to snippets.
• Reference new erdpy.

Fixes and new features

• Add Travis integration (to release to Visual Studio Code Marketplace)
• Feature: run contract snippets (deploy, call, query)
• Allow reinstall of precise, specified erdpy version (user is asked for input)
• Reference new erdpy.

Fixes

• Fix path-with-spaces issues.

Bugfixes

• Bugfix: quote path (didn't work on MacOS).

New erdpy

• Reference new erdpy beta.

Fixes and new features

• Feature: run mandos tests individually as well.
• Fix: allow user to trigger "Setup (initialize) workspace".
• Fix: enable support for non-multi-project workspaces.
• Feature: allow one to clean & build with right click on elrond.json as well

Bugfixes & a feature

Bugfixes & a feature:

• install "arwentools" if missing (since mandos is called without the erdpy intermediary since latest version).
• require precise / exact version of erdpy to be present.
• allow user to explicitly reinstall sdk module if desired