Release 2.5.0

• Merge branch 'master' of github.com:zpl-c/enet (4bfb3d9)
• Merge pull request #61 from emcifuntik/master (17cc8a0)
• code: added up to 65k peers support as optional feature, fixed possible read out of bounds and small sizeof readability improvement, tests adjustments (57a5d42)