[NEMO-294] Beam-Runner

[wonook]

JIRA: NEMO-294: Support Nemo Runner execution by providing PipelineOptions to the Beam program

Major changes:

• Update launch scripts to launch shaded jars with the current project version, instead of 0.1-SNAPSHOT
• Refactor JobLauncher so that jobs can be launched from the JobLauncher's main class as well as from a particular Beam application. This also changes so that the job ID can be received from the application itself.
• Use Google's AutoService from Beam to register NemoRunner as one of its runners with the NemoRunnerRegistrar.
• Rename NemoPipelineRunner into NemoRunner to follow conventions.
• Instead of having a default executor_json file, put in a default JSON string instead, so that it doesn't require a JSON file by default.
• Add a MinimalWordCount examples from the beam homepage (from the quickstart article)
• Now, we can create a QuickStart with the MinimalWordCount example on the Beam site by adding a simple profile on the maven pom.xml on the MinimalWordCount example.

Minor changes to note:

• Fix minor typos (e.g., confg --> config)
• Fix minor indentation inconsistencies

Tests for the changes:

• Existing tests confirm that these changes do not break the code

Other comments:

• N/A

Closes #163

[taegeonum]

Thanks! one minor comment.

[taegeonum]

@johnyangk @seojangho Could you please take a look?