Vagrant documentation fixes.
Edits:
doc/installation-makahiki-vagrant-eclipse: Image links renamed,
other corrections (see below)
doc/installation-makahiki-vagrant-quickstart: Typo fixes, added image of
server landing page.
doc/installation-makahiki-vagrant-troubleshooting: Typo fixes.
Moved:
doc/figs/vagrant-eclipse --> doc/figs/vagrant
Renamed figs/vagrant files to replace underscores with dashes:
moved: vagrant-eclipse/debug_server_demo.png --> vagrant/eclipse-debug-server-demo.png
moved: vagrant-eclipse/pydev_server_start_button.png --> vagrant/eclipse-pydev-server-start-button.png
moved: vagrant-eclipse/remote_systems_explorer_ssh.png --> vagrant/eclipse-remote-systems-explorer-ssh.png

Added:
doc/figs/vagrant/kukui-cup-demo-landing.png, an image of the Kukui Cup Demo landing page