DATAJPA-470 - Update Documentation.

Update urls to point to spring.io. Added missing id tag to documentation sections. Fix some typos in reference manual. Update readme.md to use consistent set of database and dialect. Add missing end tag for 'para' in FAQ section. Update authors for proper rendering in PDF. Added productname tag. Added links to Stack Overflow.

Original pull request: #59.
DATAJPA-469 - Prepare 1.5.0.RELEASE.

Updated change log, readme, notice. Updated links in index.xml to point to SD Commons documentation.

Original pull request: #60.
DATAJPA-469 - Release version 1.5.0.RELEASE.
DATAJPA-469 - Prepare next development iteration.
Version upgrades