Added "*.o" to .gitignore.
Created Makefile for atn (NOTE: not yet linking, just compiling and fixing
errors).
Small reorganization, all project source files go into antlrcpp, and fix up the Xcode project file.
Tree basic fixes.
Added every source file that compiles without changes (or with
minimal changes) to the Makefile default target.  Still no linking.
Fixes.
Merge branch 'feature/FirstPass_atn' of https://github.com/scottidler/antlr4cpp into feature/FirstPass

Conflicts:
	.gitignore

Merge the Linux work
WIP on ParserInterpreter.cpp which is turning out to be a complex
fix.
Fixup the API change for parser tree arrays.
Fixup the API change for parser tree arrays.
Merge branch 'feature/FirstPass' of https://github.com/DanMcLaughlin/antlr4cpp into feature/FirstPass
Fixup line endings.
Fixup line endings. Not sure why we're getting this problem.
Fixed up UnbufferedTokenStream mainly, a big set of changes.
Missed a fix in UTS
More fixes for the API change of rule names to STL.
Many fixes.
moved Makefile to its correct location ... -sai