This change removes the object hash success/error callbacks in
favor of node style callbacks. This includes README and test
updates, including the removal of two tests that are now
obsolete.

This also updates the CLI code pathway to use the node style
callback.

BREAKING API CHANGE
This removes the success/error option keys as ways to register
callbacks into node-sass. Instead, a function should be passed as
the second parameter for the asyncronous `render` call. It takes
a standard node signature of `error, callback`.

Package: Removes unused pacakge 'object-assign'

* Also moves cross-spawn under devDependencies.

Repo: Removes .npmignore, configures package.json

Based on fffc0625.

Code: Formats and fixes JSCS warnings

* To avoid validating node_modules directory.

PR URL: #723.

* Removes unused pacakge `shelljs`.
* Fixes package.json validation issue reported
  by WE2013, based on njs package.json schema:

  > *The value property "repository" must be of
   type "Object", but was "sass/node-sass"*

PR URL: #723.

Misc. improvements

* Adds instructions.
* Removes obsolete info.

This is for DRY'ing comments on repeating issues.

* Based on sindresorhus/meow#2.
* Adds alias -v.
* Improves info text; inspired by Less CLI. :)
* Updates readme.

PR URL: #717.

* Removes tests from publishing. #683
  * Uses new strategy to validate binary after
    the download.
  * Moves mocha under dev-dependencies in
    package.json.
* Truncates the forth portion from v8 version
  as discussed in #710.
* Moves pangyp from dev to main dependencies in
  package.json.

Issue URLs: #683 and #710.
PR URL: #717.

API: Retires non-standard image-path option.

Issue URL: #702.
PR URL: #704.

Adding a backwards compatible node-style callback

While updating the readme, there was inconsistency between tabs and spaces
this makes it all-spaces, which is in alignment with the JS standards for
the project. (Plus, mixing the two is some horrible form of evil)

This is node-style callbacks for #676. This allows us to release
the new callback style without introducing backwards incompatible
changes (or making changes to the binary from 2.0.1). If a node style
callback is provided, it will be used. For now, this stacks with
the original `options.success` and `options.error`, although it can
be trivially changed to an xor.

To highlight the new interface, a separate `describe` was added to the
tests which identifies the `{options}, cb` interface and tests it
independently.

CLI: Retires stdout option

When no destination or output folder is provided,
it will print the output to stdout.

If the source-map option was set, it will print
it as well.

Issue URL: #669.
PR URL: #701.

Build: Uses v8 version instead of runtime name.

The new binary path format is:
`<platform>-<arch>-<v8 version>/binding.node`

Issue URL: #694.
PR URL: #695.

Render options in callbacks as this.options

This patch and tests introduces a context for all callbacks currently
in node-sass. Right now, they run w/ an ambiguous context, making the
`this` keyword not helpful to importer developers (and eventually
custom function developers). This creates a context object, adds the
render options to said context object, and then uses that context for
importer, success, and error callbacks via `this.options`.

By using a context instead of just `.call(options...)` there is a hook
for later should we find additional environmental information is
valuable to importer / custom function developers such as the node
environment, node-sass version, etc.

Misc. Fixes

On Windows, process.execPath does not
get resolved symlink path. This commit
fixes the issue.

Related Issue: iojs/io.js#851.
PR URL: #668.

* Returns json-string error from LibSass as is.
* Extends empty error object with parsed JSON.

Note: The reason why  NanError  is not used
because LibSass returns error as JSON string
with  message  as member, so we would have to
reparse and reassign the obj in that case.

Issue URL: #675.
PR URL: #668.

* Reason: njs v0.11 is not relavent any more.
* Solution: Update to node v0.12 with which
            node-sass v2.0.1 is compatible OOTB.

Code: Minor fixes.

Package: Updates libsass verion

* Locking down v2.0.0.
Related Issue: #602.