Instrument feature for functions

[mperdeck]

Feature that allows you to instrument all functions in a namespace (which is a variable containing an object that contains members of type function). Option to only instrument those functions whose names match one of a list of regexs (only works if the functions are not anonymous).

Instrumentation options:

1. surround with try catch (catch exception, log it, rethrow with a flag saying it has been logged to prevent relogging)
2. log parameter values (DEBUG logger)
3. try finally to measure execution time of the function