libuEv v1.0.5

Changes

• Add uev_*_start() functions.
• Add slightly odd examples/signal.c example that utilises fork()
  and causes segfault in child.
• Renamed main.c to uev.c
• Move examples to examples/ subdirectory
• Simplify automatic dependency calculation
• Add TODO.md for wishlist items
• Add [CHANGELOG.md], attempt to align with http://keepachangelog.com
• Further updates to README.md