update gitignore
Use Antlr from Nuget
remove unused usings
Remove redundant ToStrings
Remove redundant casts
Remove redundant empty constructors
join declarations and assignments
use IEnumerable
simplify instance check
use readonly where possible
remove useless setters and trailing semicolons
use reference equality
use IsInstanceOfType
remove redundant qualifiers and redundant defaults in switch statements
Merge branch 'master' of https://github.com/EmbraceUnity/Jint

Conflicts:
	Jint/Jint.csproj