Adding grammar and result mock file set for tests
Adding `GrammarResolver_Helper::getFirstSet`
Moving grammar cleanup into its own little function
Adding `GrammarResolver_Helper::getFollowSet`
Merge pull request #31 from AnhNhan/master

Updating PhisonGrammar
Splitting grammar resolver helper methods into regular and clean variants
Oopsie
Fixing the oopsie
Converting tabs to spaces -.-
Making stuff public, because you know, you need them
Rewriting tests to be data provider based
Removing dead code
Starting to restructure how the language looks like
Missing brace in comment
Minor changes to Introduction
Merge pull request #33 from AnhNhan/dev

Rewriting Symbol utilities, adding error handler
Merge branch 'dev'
Update 01 - Introduction.md
Update basicfunction.al
Update iteration.al