Added some interesting comments.
Refactored code.
Fixed 'show all' namespaces to include interactive.
Fixed code indentation.
Added simple linker.
Added 'FileSystem'.
Added simple 'Definition'.
Integrated 'Definition' in all compilation stages.
Removed 'ts' field from 'SrcFile'.
Removed 'exprs' field from 'SrcFile'.
Removed 'symbols' field from 'SrcFile.'
Fixed 'showAll' in showing commands.
Fixed interactive and repl srcfiles.
Merge branch 'fix'

Conflicts:
	Repl.hs
Merge branch 'master' of github.com:jabolopes/bessel

Conflicts:
	Data/Definition.hs
	Data/FileSystem.hs
	Data/SrcFile.hs
	Interpreter.hs
	Linker.hs
	Renamer.hs
	Repl.hs
	Typechecker.hs