package: remove "node-gyp" dependency

Node <= 0.8.x were having problems installing this dep.
Attempt to leverage npm's internal copy of node-gyp instead.
appveyor: call `npm run rebuild-tests`

Hopefully npm's internal node-gyp will be used here.
travis: remove extraneous `npm install` invocation

Travis-CI does this implicitly for us
Get rid of all warnings and errors on Windows.
Merge branch 'master' into windoze
added 0.10.29
remove older 0.11 versions
fix dnt setup
CI bump
Adding async.h to the README.
Changing 2015 to 2014 in the last changelog entry.
Merge pull request #158 from jsdevel/adding-async.h-to-the-readme

Adding async.h to the README.
Merge pull request #159 from jsdevel/fixing-changelog-in-nan.h

Changing 2015 to 2014 in the last changelog entry.
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...
Merge pull request #149 from kkoopa/windoze

Get rid of all warnings and errors on Windows.
fixed indentation