Respect file paths in destination

Introduces grunt-frienly way of configuring task with glob patterns.
Define 'cwd' and 'dest' directories and list your sources under 'src' with patterns that support nested directories:

  - *.html
  - {,*/}*.html
  - {,**/}*.html

Results are put to 'dest' with respect for their original path under 'cwd'. Fixes the issue of results being dumped into single directory.

README.md

@@ -28,10 +28,12 @@ Then specify your config:
                 supportedTypes: { 'phtml': 'html' }
             },
             dist: {
-                /** @required  - string (or array of) including grunt glob variables */
-                src: ['./static/*.html', './static/*.css', './static/*.soy'],
-                /** @optional  - if provided a copy will be stored without modifying original file */
-                dest: './dist/static/'
+                /** @required  - gets sources here, may be same as dest  */
+                cwd: './dist/static/',
+                /** @required  - puts results here with respect to relative paths  */
+                dest: './dist/static/',
+                /** @required  - files to process */
+                src: ['index.html', '*.css', '{,*/}*.html', '{,**/}*.html'],
             }
         }
     });

tasks/grunt-cdn.js

@@ -25,11 +25,17 @@ module.exports = function(grunt) {
     }
 
     files.forEach(function(file) {
+      if(!('dest' in file) || !('cwd' in file)) {
+        var msg = 'Configuration error: please set "cwd" and "dest" properly';
+        grunt.log.error(msg);
+        throw msg;
+      }
+
       file.src.forEach(function (filepath) {
-        var type = path.extname(filepath).replace(/^\./, ''),
-            filename = path.basename(filepath),
-            destfile = (file.dest && file.dest !== filepath) ? path.join(file.dest, filename) : filepath,
-            content = grunt.file.read(filepath).toString(),
+        var full_path = path.join(file.cwd, filepath),
+            type = path.extname(filepath).replace(/^\./, ''),
+            destfile = path.join(file.dest, filepath),
+            content = grunt.file.read(full_path).toString(),
             job; // sometimes css is interpreted as object
 
         if (!supportedTypes[type]) { //next