show timestamp at top of compiled jobs / services / tests

[allanbowe]

It would be helpful to know when a particular Job / Service / Test was compiled

At the top of each compiled file we should include some additional metadata, such as:

• A human readable timestamp
• Username which compiled the file (if possible)
• Machine which compiled the file (if possible)
• serverType of compilation
• target Name (maybe even a JSON dump of the target object?)