CI: Build for node 5.x

Added a test for #1219

The previous file should be the absolute path, not the string used to import it.

fix to allow node-sass to pipe content with embedded sourcemap to other tools

making sass logo size more appropriate

Bump LibSass to 3.3.1

Bump LibSass to 3.3.0

Bump LibSass to 3.3.0-beta3

Fix a typo "repsonse" to "response".

Fixed typo "Sepcial" to "Special" in "// only one of them is required, see section Special Behaviours" (line 319 in examples section) in README.md.

Add --follow option to the CLI

Use sass binary url from .npmrc if available

For pull requests and pushes to master just build 32-bit binaries
and do not store artifacts.

Whenever a tag is pushed to the "release" branch - produce
full set of 32-bit and 64-bit binaries, create a GitHub
release (if does not exist already) and attach the binaries
to the release.

Issue open:

http://bit.ly/twoBuilds

 AppVeyor starts two builds in response to the "new commit"
 and "new tag" events.

Import libsass 3.3 code

- New source layout
- New header names for #include
- No need for exception handling in pure C code

Sometimes they generate double notification
on change:

      1) cli node-sass in.scss should watch the full scss dep tree for a single file (scss):

      Uncaught AssertionError: 'body{background:blue}\n\nbody{background:blue}' == 'body{background:blue}'
      + expected - actual

      -body{background:blue}
      -
       body{background:blue}

      at Socket.<anonymous> (test/cli.js:317:16)
      at readableAddChunk (_stream_readable.js:146:16)
      at Socket.Readable.push (_stream_readable.js:110:10)
      at Pipe.onread (net.js:523:20)

https://github.com/sass/node-sass/issues/1152

Fix race conditons in watcher tests