Vagrant documentation fixes, removal of install/ scripts

This pull request contains Vagrant documentation fixes. It also removes the install/ directory.

Deleted
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Everything in the "install/" directory. Scripts have been moved to http://github.com/jtakayama/makahiki-installation-python-scripts for future reference)

Added
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* doc/figs/vagrant/kukui-cup-demo-landing.png: an image of the Kukui Cup Demo landing page

Edited
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* doc/installation-makahiki-vagrant-eclipse.rst: Image links renamed, other corrections (see "Moved")
* doc/installation-makahiki-vagrant-quickstart.rst: Typo fixes, added image of server landing page.
* doc/installation-makahiki-vagrant-troubleshooting.rst: Typo fixes.
* doc/installation-makahiki-vagrant-environment-setup.rst: Base box ``precise32`` is now downloaded before source code is.

Moved
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* Moved doc/figs/vagrant-eclipse --> doc/figs/vagrant
* Renamed figs/vagrant files to replace underscores with dashes:
  * vagrant-eclipse/debug_server_demo.png --> vagrant/eclipse-debug-server-demo.png
  * vagrant-eclipse/pydev_server_start_button.png --> vagrant/eclipse-pydev-server-start-button.png
  * vagrant-eclipse/remote_systems_explorer_ssh.png --> vagrant/eclipse-remote-systems-explorer-ssh.png