https://github.com/sass/libsass/releases/tag/3.5.0

Saw this trick in another repo and though it made sense

We still want these till we officially drop the EOL Node versions

In this way his past contributions are mapped correctly, including collapsing
two different ways of writing "ę" into one.

Fixed a Typo

Related https://github.com/barsh/true-case-path/issues/2

Fixes #2157

Closes #2161

request@2.81.0 breaks Node < 4 compat.

This was added in #2149 but doesn't support Node < 4

Fix watching of entry points

Currently changes to non-partials are being picked up. This PR Fixes
that and adds addition test coverage.

Fixes #2139

Fix Some Leaks

* Use true-case-path

* Fix failing tests

* Delete package-lock.json

* .gitignore package-lock.json

## Fixes

- Problem with watcher (@evanfuture, #2147)

## Supported Environments

| OS | Architecture | Node |
| --- | --- | --- |
| Windows | x86 & x64 | 0.10, 0.12, 1, 2, 3, 4, 5, 6, 7, 8, 9 |
| OSX | x64 | 0.10, 0.12, 1, 2, 3, 4, 5, 6, 7, 8, 9 |
| Linux* | x86 & x64 | 0.10, 0.12, 1, 2, 3, 4, 5, 6, 7, 8, 9 |
| Alpine | x64 | 4, 6, 7, 8, 9 |
| FreeBSD  10+ | i386 | 4, 6, 8 |
| FreeBSD 10+ | amd64 | 4, 6, 8 |

*Linux support refers to Ubuntu, Debian, and CentOS 5

* gaze.watched returns an object

Since it returns an object, we need to run through the keys, a simple index of isn't enough.  This should fix https://github.com/sass/node-sass/issues/2139

Pointing them to the release notes is safer since it will accurately reflect the support for that version of node-sass

Removed 55 since it was part of a prerelease Node 8 only

Nan::ObjectWrap Docs: https://github.com/nodejs/nan/blob/master/doc/object_wrappers.md#api_nan_object_wrap

Prior to this, all wrapper Objects would never be deleted, allowing memory to grow unbounded.

Example:
The following, would leak WrapperObjects, and never

```
while (true) {
  new sass.types.String(‘I LEAK’);
}
```

* boolean
* function-bridge
* map
* string

Improved the grammar and clarity of the instructions in this project's README

* Remove Node 0.10 and 0.12 from travis config

These will always fails now due to https://github.com/sass/node-sass/issues/2100. We manually verify support when building release binaries so there's no value in failing CI. It's scary to contributors.

* Remove Node 0.10 and 0.12 from appveyor config

These will always fails now due to https://github.com/sass/node-sass/issues/2100. We manually verify support when building release binaries so there's no value in failing CI. It's scary to contributors.

* Link to the troubleshoot guide for Node < 4 installation issues

Help people search for keywords because noone reads the help guides anyway.