extract srcDir and outDir from individual test methods
[BREAKING CHANGE] fix #79 and a FIXME in the code

 - WARNING: This commit changes existing behavior and may therefore break builds using the asciidoctor plugin
   - additional validation step which checks for every file in the sourceDocumentNames if it is reachable from the sourceDir
   - use canonicalPath to compare files instead of just comparing the file name.
fix tests which were broken by the previous commit

 - the previous commit introduced a breaking change. the fix for failing tests were committed separately in this commit to emphazise this fact.
update terminology and wording

- use the terminology "Converting" instead of "Rendering"
- update wording in log messages to be more explicit
Add epub3 as a built-in backend name
Merge pull request #88 from sclassen/master

fix issue #79
Merge pull request #91 from mojavelinux/terminology-wording

update terminology and wording
Merge pull request #93 from mojavelinux/epub3-backend

Add epub3 as a built-in backend name
Bump version
Update to Asciidoctor 1.5.0
Add a description to the asciidoctor task. Fix #100
Merge pull request #97 from mojavelinux/master

Update to Asciidoctor 1.5.0
Finish up migrating to asciidoctorj 1.5.0
resolves #98 add configuration for gemPath and requires
Merge pull request #99 from mojavelinux/issue-98

resolves #98 add configuration for gemPath and requires
Refine error message when sourcedocumentNames contains absolutePaths
Merge branch 'master' of github.com:asciidoctor/asciidoctor-gradle-plugin
resolves #96 attempt to configure AsciidoctorJ in isolation
Fix broken build
Upgrade build dependencies