Fix excluding of docs tests so it also excludes compilation.
Improve excluding of distribution tests.
Support -Dorg.gradle.integtests.versions=«gradle version»[,«other versions]*

Makes it easier to run a compatibility test against a specific version.
State the 1.4-rc-1 has the current artifact cache number, not 1.4.
Always create integ test tasks, instead of using a rule.

This is needed to make the exclusions work correctly (see distributions project).
Ack. Forgot to uncomment this.
Merge branch 'release'