'' category and Invalid version warnings

[keremers]

After installing the arduino_UIP the ide displays 2 warnings during compile and otherwise:
WARNING: Category '' in library UIPEthernet is not valid. Setting to 'Uncategorized'
and
Invalid version found: 1.04

Issue #135 addresses the category issue. But Invalid version warning persists. It is a major nuisance because the error keeps repeating itself during each compile. The fix is simple. The version number format expeected by arduino is 1.0.4 ot 1.04. I've also put a modified library.properties in pull requests tab.

[BerranRemzi]

For warning "Uncatogorized" i post edited version or library.properties.

[per1234]

See #165 (comment)