Extracted ThreadSafeLogger into separate module.

Added maven target/ folders to .gitignore.

Incremented lpr version to 0.0.4

Incremented hpnp version to 0.0.7
Package 'logger' with 'lpr' and 'hpnp'.
Merge pull request #1 from fourcube/master

Extracted ThreadSafeLogger into separate module.