Added NanSetInstanceTemplate
one space too much ;)
Added support for PropertyAttributes

Overloaded functions for ```NanSetTemplate()```,
```NanSetPrototypeTemplate()``` and ```NanSetInstanceTemplate()```. Test
cases are included.
Updated Readme
small fix for 0.11

Set() does not get an isolate argument if attribute is given...
fixed indentation
Merge branch 'Overloaded-Template-Set' of https://github.com/mathiask88/nan

Conflicts:
	nan.h