Upgraded to Spring Data Codd SR1.

Fixes gh-490
Polish
Polish javadoc formatting
Set correct github tag for generated docs
Add missing main.basedir property to docs pom
Port ViewResolver docs

Port documentation originally added in commit b56bd0a10c76
Port Add Maven example for Tomcat 8

Port Add Maven example for Tomcat 8 from markdown to asciidoc.
(originally from commit 15372cb73786d9a82abbd441b0c9e04a68967829)
Fix some broken documentation links
Remove duplicate documentation

Remove README files that have been since been migrated to the reference
documentation. Also updated remaining markdown files to asciidoctor to
save having a mix of different formats.

Fixed gh-503
Minor doc polish
Add properties syntax highlighting for docs

Fixes gh-495
Remove double quotes from sample in appendix B

Fixes gh-492
Fix typo
Add a couple more tests on profile ordering
Make Spring Boot work in Java 1.6 on Mac OS X

Currently Spring Boot fails in Java 1.6 on Mac OS X due to the
"tools.jar" being integrated into classes.jar in the Apple version of
Java 6.

Apple fixed this with Java 7, but we should still support Java 6. We had
to roll back to maven-plugin-plugin 3.1 to make this work with Java 6
and 7.

All tests pass with Java 6 and Java 7.
Add javaodcs about @IntegrationTest to SpringApplicationContextLoader

See gh-499
Review first 8 parts of the doc

This commit mostly fixes typos but also improves slightly specific
areas, adding links when it make sense.
Merge pull request #508 from snicoll/docs

* docs:
  Review first 8 parts of the doc
Fix lets -> let's in documentation
Remove quotes from internal documentation links

Remove quote-marks from internal documentation links and instead favor
italics.