added an "--input-file" command line option
added a Token class
set conventions
added TokenException
using our Token class to attach ranges to tokens

for more detailed error reporting
macro support is throwing off token ranges
copy binary into the Build folder on OS X
handle escaped character ranges properly
defined an EmptyToken constant
added Token.cpp to Xcode project
better error handling
updated MacroProcessor to use Tokens
need EmptyToken again
adding unit tests for MathML output and error reporting
compiles with Makefile again
Merge pull request #2 from mattrajca/master

Added Token class, improved error handling, unit tests