Merge pull request #572 from jtakayama/master

Added a brief introduction to command line terminal use.
Merge pull request #573 from jtakayama/master

doc/installation-makahiki-vagrant-environment-setup.rst: Edits to command line terminal explanations.
Update installation-makahiki-vagrant-quickstart.rst: Changed "throughout this guide" to "in this article." Edited section to state that commands on host OS are cross-platform.