chore(grunt): support semver v2 version number format

previously we couldn't use it because of bower bugs

Author: IgorMinar

lib/grunt/utils.js

@@ -17,13 +17,17 @@ module.exports = {
     if (version) return version;
 
     var package = JSON.parse(fs.readFileSync('package.json', 'UTF-8'));
-    // TODO(brian): change `(-|rc)` to `-` in the regex below after bower
-    // fixes this issue: https://github.com/bower/bower/issues/782
-    var match = package.version.match(/^([^\-]*)(?:(-|rc)(.+))?$/);
+    var match = package.version.match(/^([^\-]*)(?:\-(.+))?$/);
     var semver = match[1].split('.');
     var hash = shell.exec('git rev-parse --short HEAD', {silent: true}).output.replace('\n', '');
 
-    var fullVersion = (match[1] + (match[2] ? '-' + hash : ''));
+    var fullVersion = match[1];
+
+    if (match[2]) {
+      fullVersion += '-';
+      fullVersion += (match[2] == 'snapshot') ? hash : match[2];
+    }
+
     version = {
       full: fullVersion,
       major: semver[0],