Support for cwd + source path

This adds support for changing the current working directory via
options, and uses the source path (relative to the cwd) instead of just
the filename when determining the destination path.

lib/grunt-text-replace.js

@@ -25,12 +25,19 @@ exports.replaceFileMultiple = function (settings) {
 
 gruntTextReplace = {
   replace: function (settings) {
-    var src = grunt.file.expand(settings.src || []);
+    var src = settings.src || '';
     var dest = settings.dest;
+    var cwd = settings.cwd;
+    var prevCwd;
     var overwrite = settings.overwrite;
     var replacements = settings.replacements;
     var isDestinationDirectory = (/\/$/).test(dest);
     var initialWarnCount = grunt.fail.warncount;
+
+    if(cwd) {
+      prevCwd = process.cwd();
+      grunt.file.setBase(cwd);
+    }
 
     if (typeof dest === 'undefined' &&
         typeof src === 'undefined' &&
@@ -53,6 +60,10 @@ gruntTextReplace = {
         replacements: replacements
       });
     }
+
+    if(prevCwd) {
+      grunt.file.setBase(prevCwd);
+    }
   },
 
   errorMessages: {
@@ -114,12 +125,11 @@ gruntTextReplace = {
 
   getPathToDestination: function (pathToSource, pathToDestinationFile) {
     var isDestinationDirectory = (/\/$/).test(pathToDestinationFile);
-    var fileName = path.basename(pathToSource);
     var newPathToDestination;
     if (typeof pathToDestinationFile === 'undefined') {
       newPathToDestination = pathToSource;
     } else {
-      newPathToDestination = pathToDestinationFile + (isDestinationDirectory ? fileName : '');
+      newPathToDestination = pathToDestinationFile + (isDestinationDirectory ? pathToSource : '');
     }
     return newPathToDestination;
   },
@@ -172,4 +182,4 @@ gruntTextReplace = {
     return isProcessTemplateTrue ? grunt.template.process(string) : string;
   }
 
-}
+}