Change CRYSTAL_PATH to allow shards to hide std-lib (#56)

Author: Brian J. Cardiff

linux/files/crystal-wrapper

@@ -97,7 +97,7 @@ _canonicalize_file_path() {
 SCRIPT_DIR="$(dirname "$(realpath "$0" || echo "$0")")"
 ROOT_DIR="$SCRIPT_DIR/.."
 
-export CRYSTAL_PATH="${CRYSTAL_PATH:-"$ROOT_DIR/share/crystal/src:lib"}"
+export CRYSTAL_PATH="${CRYSTAL_PATH:-"lib:$ROOT_DIR/share/crystal/src"}"
 export PATH="$ROOT_DIR/lib/crystal/bin:$PATH"
 export LIBRARY_PATH="$ROOT_DIR/lib/crystal/lib${LIBRARY_PATH:+:$LIBRARY_PATH}"
 export CRYSTAL_LIBRARY_PATH="${CRYSTAL_LIBRARY_PATH:+$CRYSTAL_LIBRARY_PATH:}$ROOT_DIR/lib/crystal/lib"