Added a new self-update command to easily update the installer
feature #41 Added a new self-update command to easily update the installer (javiereguiluz)

This PR was squashed before being merged into the 1.0-dev branch (closes #41).

Discussion
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Added a new self-update command to easily update the installer

This fixes #36

Commits
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1f03973 Added a new self-update command to easily update the installer