Partial fix for #10 , the lexer & parser can now handle curly brace, but target editor needs to be updated to support selecting multiple segment nodes

added more function definitions, added small hack to make randomWalk and countLine that do not take any series work with the parser and target editor (the whole target editor and parsing & back to target rendering needs to be rewritten to handle functions that take multiple series)

Fixing download link in README

Conflicts:
	src/app/panels/graphite/module.html