Throw on allocate or acquire errors

[varunsh-xilinx]

Style fixes

Summary of Changes

• Catch exceptions thrown by allocate() and acquire() during worker loading

Closes #28

Motivation

Loading workers can fail for a variety of reasons. Before, only worker exceptions thrown during init() were caught. Now, exceptions thrown in all the initialization methods can be reported back to the client.

Implementation

Try-catch blocks around the methods in question perform local clean-up and then re-throw the exception. It's eventually caught by the Manager and the error is passed to the client.

Some style changes are also implemented to refactor some code and change some function signatures.