Add support for keyword in commit message.

For example:
PPLN_IGNORE. Commit message...
Command for pipeline to ignore this commit.

Or maybe add more flexibility and send any arguments from commit message to control flow of deploy/build scripts.

For example:
PPLN_SMITH. Commit message...
Extract custom arguments 'SMITH' and assign it to environment variable. Deploy scripts use this variable and deploy this build only for Smith.