DOC-1034: technical review edits
DOC-1220: install-guide ditamap updated to include section on removing cached VMware EMI images.
DOC-1220: new topic to address removing cached EMIs in VMware broker.
DOC-1220: included graphic for removing cached EMI images.
DOC-1220: changes to install-guide DITAmap; add topic for removing cached EMI images from VMware broker and associated graphic in image directory.
Merge branch 'master' of git.eucalyptus-systems.com:documentation
DOC-1034: tech review edits
Merge branch 'master' of git.eucalyptus-systems.com:documentation