Make the news ticker more generic

Use CSS class name, not the `#news` DOM ID.
Added ticker with Training dates to the "Guide" and "Download" pages

The source data are in "training.json"
Changed ticker on homepage to show Trainings
Remove the underline from links in the ticker
Update guide/reference/api/search/uri-request.textile

Add "count" & "scan" to the list of "search_type" allowed values
Merge pull request #333 from aferreira/patch-3

Update guide/reference/api/search/uri-request.textile
Update links.
Post about new download service.
Typo & formatting.
Speed up deletion.
Fix link.
Fixed typo on home page
Merge pull request #335 from juzerali/typo

Fixed typo on home page
Bump Java requirement to 7
Use Java 6 as minimum version
Revised the "Deploying Elasticsearch with Chef" tutorial

* Overall copy cleanup
* Instructions for the new cookbook support for EBS-based local gateway
* Minor additions
Minor updates to the "Deploying Elasticsearch with Chef" tutorial

Typos, formatting errors, formulations.
Add Clojure REPL mention.
Elaborate.
Added part about adding EBS disks to node in the "Deploying Elasticsearch with Chef" tutorial