Update installation by .deb for Debian

Include basic manual instructions for Debian Squeeze, tweak existing
Step1 title to include "(Ubuntu)" for clarity.
edit windows faq
edit quickstart windows note
edit monitoring.txt
add kibana three image and video
upgrade sinatra-assetpack for better caching
longer cache for production
"Kibana3 --> Kibana 3" (for consistency)
Merge pull request #21 from jmoses/master

Update .deb instructions for Debian
minor edit: install-by-deb
add testimonial from NAMCO BANDAI Studios Inc.
update ja users
fix broken link
added more info on fluent-gem for td-agent to FAQs
fix typo in the previous commit
updating last-updated
Add windows branch link
edit splunk alternative doc for user friendliness
edit recent faq additions
user company name changed (NHN Japan -> LINE)