add 4.2.0.Final to download page

add JBDS 8.0.0.GA to download page and remove marketplace links from pre-GA milestones
blog for 4.2 GA
fix typos metadata and mention of kepler in hardcoded places
fix more typos
fix link in release blog
fix blog announce link
remove 4.2.0.GA mentions
Fixing the title position on blog posts
Fixing the empty link to the marketplace page
Fixing broken link to blog announcement
Fixing broken link to download JBoss Tools 4.2.0.Final in blog post
fix links to JBT 4.2.0.Final (not GA) and bump link to JEE bundle to SR1 (not R)
replace contributor list which was erroneously removed
Fix typo: Lunix -> Linux
Update YYYY-MM-DD-blog-title.adoc.template

Fixing typos
TOOLSDOC-550: Added howto template
Fix typo in pre-final What's New pages
Fix a few links and typos in the 4.2.0 Final release blog
JBIDE-18702 JBDS 8.0.0.CR1 and GA contain EAP 6.3.0, not EAP 6.3.0.Beta; fix label
SmallFixes to OpenShift How Tos