v0.5.0 first version

First version of java-watch. Included features:

• Monitor changes at:
  • single entry level
  • directory level (only direct descendants)
  • all descendants level
• Handle OVERFLOW events:
  • Yourself
  • We generate events for all current entries on disk
  • We keep track of changes in a map, and based on modification stamp generate a most likely events
• extensive tests for Linux/Windows/OSX support