bbwp.bat should return a non-zero value (ERRORLEVEL) when an error occurs

[psiborg]

To help automate the build process, it would be useful if bbwp.bat returns a non-zero ERRORLEVEL when errors occur (e.g., during signing):

[INFO] Populating application source
[INFO] Parsing config.xml
[INFO] Generating output files
[INFO] Info: Package created: [ERROR] Error: Code signing request failed because this version of the application or package has been previously sign
ed. Please increment the version(s) and try signing again.

Currently, this returns "ERRORLEVEL = 0".

[rtholmes]

Same problem on OSX;

test:
[exec] [INFO] Populating application source
[exec] [INFO] Parsing config.xml
[exec] [INFO] Generating output files
[exec] [ERROR] Error: Attribute image: file cannot be found in the list of packaged files: foo.png
[exec] [ERROR] Native Packager exception occurred
[exec] [ERROR] Error: Attribute image: file cannot be found in the list of packaged files: foo.png
[exec] [ERROR] Native Packager exception occurred

BUILD SUCCESSFUL

bbwp needs to return appropriate codes so build scripts can better detect and respond to errors.