Added makefile for cross-platform compilation.
Fixed up makefile.
Added define to comment out code for Mac OS X builds.
Changed starting index to fix OS X error.
Fixed issue with OS X not supporting wxCB_SORT.
Added bounds checking.
Changes to use GetCurrentSelection() and wxNOT_FOUND for selection checking.
Replaced tabs with spaces. Added remaining bounds checking and GetCurrentSelection() checking.
Move text files as part of make process.
Merge pull request #2 from grantjbutler/makefile

Cross-platform compilation