Fix certain arguments not being correctly escaped or causing batch syntax error

[satazor]

More specifically:

• Fix a bug that made it impossible to escape an argument that contained quotes followed by > or other special chars, e.g.: "foo|bar", fixes Bad escaping when an argument has quotes followed by a pipe #82
• Fix a bug were a command containing %x% would be replaced with the contents of the x environment variable, fixes Fixes bug: unable to spawn .bat with %<environment variable>% in name #51

This was resolved by using ^ to escape all meta chars.
Additionally, double escaping was necessary for cmd-shim files located in node_modules./bin/.

Also, this commit was a major overhaul:

• Upgrade tooling
• Upgrate project to es6 (node v4)
• Fix commands as posix unix relatixe paths not working correctly
• Fix options argument being mutated
• Improve compliance with node's ENOENT errors
• Improve detection of node's shell option support
• Migrate project to moxystudio

BREAKING CHANGE: remove support for older nodejs versions, only node >= 4 is supported

[satazor]

This PR is blocked until a bug in npm is solved regarding executables in node_modules/.bin.

[cspotcode]

@satazor: I'm curious, what's the NPM bug? Do you have a link to their issue tracker?

[satazor]

I can't disclose the bug because it's also a security vulnerability.

I can email you though.

[cspotcode]

Sure, I'm [email protected]. Thanks.

[andrew-c-tran]

Any updates to this PR? I've traced a webpack bundling warning in my electron app back to this library attempting to require spawn-sync. This PR by removing node v0.10 support, that should correct the build warning.

[satazor]

I've updated the PR. I will merge this once it becomes green and release 6.0.0.

[codecov]

Codecov Report

Merging #83 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff           @@
##           master     #83   +/-   ##
======================================
  Coverage    98.8%   98.8%           
======================================
  Files           7       7           
  Lines         167     167           
  Branches       35      35           
======================================
  Hits          165     165           
  Misses          2       2

Impacted Files	Coverage Δ
lib/util/escape.js	100% <100%> (ø)	⬆️
lib/util/readShebang.js	100% <100%> (ø)	⬆️
test/util/run.js	100% <100%> (ø)	⬆️
lib/util/resolveCommand.js	100% <100%> (ø)	⬆️
index.js	100% <100%> (ø)	⬆️
lib/parse.js	96.15% <100%> (ø)	⬆️
lib/enoent.js	100% <100%> (ø)	⬆️

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[satazor]

@cspotcode I've fixed the issue regarding the npm cmd-shim by double-escaping the windows shell meta chars. I've tested this exhaustively and it's working correctly!