ZEST / base.gruntrunner / Module: tasks/observe

this function registers a grunt task to run tests (and optionally documentation) on file changes. The below tasks are created

• watch:lib for watching lib file changes and running lib-queue when files change
• watch:test for watching test file changes and running test-queue when files change. This task is only available if test files exist.
• watch:build for watching build file changes and running build-queue when files change
• lib-queue which runs the jshint and test scripts for lib files. If docs option is set, instead of jshint and test scripts, the documentation script is run.
• test-queue which runs the jshint script for lib files and test scripts. If the test files do not exist, this script is not generated.
• build-queue which runs the jshint and test scripts for build files
• watch watches for lib, test and script changes together
• observe runs the initial list of tasks and starts the watch
• deafault is an alias for observe