Standardize service execution scripts

[cancilla]

Some services are launched via a shell script (i.e. Vines) and some services are launched using Gradle (i.e. Watson Explorer services).

Need to migrate all services such that they are launched via Gradle rather than a separate script. Using Gradle allows for the dependencies to easily be added to the classpath when launching, rather than having to copy the dependencies into a shell script.

[chanskw]

Building ExampleService to help standardize thils