Add missing config for web development server in Linux walkthrough
Update instructions for 12.04 and onwards

- Add instructions to install OpenJDK 7 on recent platforms
- Add Ubuntu versions to liblzo installation note
Fix various stylistic markups to align them with doc policies
Align OSX/Linux walkthrough structures
Fix indentation throughout the page and minor markup
Add Ice 3.4 to the list of supported Ice versions for 12.04
Unify development server sections of both walkthroughs
Move developer section to a standalone document included in the walkthroughs
Edits to OME-TIFF section
merge dev_4_4 -D org -I include -E exclude: PR 281 (Review Matlab documentation (see #10389))
merge dev_4_4 -D org -I include -E exclude: PR 291 (Add "Link" action to permissions table and to the Key 4)
merge dev_4_4 -D org -I include -E exclude: PR 296 (Putting OME-XML formats docs into ome-docs repo)
merge dev_4_4 -D org -I include -E exclude: PR 301 (Walkthrough fixes)