Homepage changes per marketing/product mgmt

- Adds a banner for an upcoming webinar (still waiting for the link)
- Adds a section for dev tools (apigility, z-ray, studio) above news
- Adds a slide-up pop-in ad for z-ray (with cookie, which prevents display on
  subsequent visits). Required adding ability to inject inline scripts in the
  layout.
Zend Server ad for downloads sidebar
Linked to webinar
Updated homepage based on template
Merge branch 'feature/zend-server-promo'
Updated link for slide-in image
Merge branch 'hotfix/demo-link'
Fix img src for sidebar promo

- Used basePath() instead of relative URL
Merge branch 'hotfix/downloads-sidebar'
[#128] retain manual page on version switch

- Applied patch from @tfountain (patch has since been removed, so had to do it
  using diff from pull request).
Merge branch 'hotfix/128'

Close #128
[#85] "current" manual version

- Added to "version" constraint the ability to specify "current"
- Injecting Manual PageController with latest version
- Checking if version specified is "current"; if so, using latest
  version
- Checking if version specified is latest version; if so, redirecting to
  "current"
[#85] Inject canonical rel into manual pages

- If 1.* page, inject link to latest 1.* manual page
- Otherwise, inject link to "current" version
Merge branch 'feature/85'

Close #85
[#85] Fix manual redirects

- If no version is provided, use 'current'
Merge branch 'hotfix/85'
[#85] More rewrite fixes

- Old manual rewrite was a straight regex -- but that regex could match
  "current" as the language. Updated to fix this.
- Also, old manual rewrite did not include a "/" after language!
Merge branch 'hotfix/85'
[#85] Get redirect plugin explicitly

- Was getting 500 errors
Merge branch 'hotfix/85'