Add NuGet + helper script for UNIX systems

* run fetch-nuget-packages.sh on UNIX sytems before opening
  the solution on UNIX systems
Forced re-merge when setting user or default configs. Fixes Dynalon/JsonConfig#11
Merge pull request #12 from areyling/master

Fix for #11
Update README.md

try to get syntax highlighting on GitHub
Syntax highligh in README.md
Implemented ConfigObject:GetEnumerator()
Merge pull request #15 from raistlinthewiz/master

Implemented ConfigObject:GetEnumerator()
Merge branch 'master' of https://github.com/Dynalon/JsonConfig

Conflicts:
	JsonConfig/ConfigObjects.cs