dtcw: closes docToolchain#1031, improve output to guide the user

- Fix bug docToolchain#1031
- Fix: support of JAVA_HOME which was silently ignored.
- Add `--version` option
- dtcw API change: use explicit 'install' command to install components.
- Improve output: provide the concept of 'environments'.
- Refactoring to replace 6 boolean flags with descriptive functions

Tests:
- Use mocks for dtcw test suite to improve performance.
- Added end-to-end tests for installation in 'local' and 'sdk'
  environments.

.gitmodules

@@ -4,3 +4,18 @@
 [submodule "resources/asciidoctor-reveal.js"]
 	path = resources/asciidoctor-reveal.js
 	url = https://github.com/asciidoctor/asciidoctor-reveal.js
+[submodule "test/bats"]
+	path = test/bats
+	url = https://github.com/bats-core/bats-core.git
+[submodule "test/test_helper/bats-support"]
+	path = test/test_helper/bats-support
+	url = https://github.com/bats-core/bats-support.git
+[submodule "test/test_helper/bats-assert"]
+	path = test/test_helper/bats-assert
+	url = https://github.com/bats-core/bats-assert.git
+[submodule "test/test_helper/bats-file"]
+	path = test/test_helper/bats-file
+	url = https://github.com/bats-core/bats-file.git
+[submodule "test/test_helper/bats-mock"]
+	path = test/test_helper/bats-mock
+    url = https://github.com/mh182/bats-mock.git