socorro-syms: Add Breakpad symbol generation adapted for Socorro

https://github.com/mozilla/socorro



Mozilla Socorro is a downloadable crash dump server that handles
Breakpad crash dumps coming from own applications. In order for
Socorro to create clickable links into your source code repository,
Breakpad's symbol files must be copied and modified to contain VCS
information for each file reference.

This class reads the symbol file generated by Breakpad and creates
a new symbol file with that VCS information contained.

Signed-off-by: Daniel Markus <daniel.markus@leica-geosystems.com>