Fixed declaration and tests

gulp-help-doc/gulp-help-doc-tests.ts

@@ -15,7 +15,7 @@ gulp.task('demo', function() {});
 
 let logger: {
     output: string,
-    log(msg: string)
+    log(msg: string): any
 } = {
     output: '',
     log: msg => logger.output += msg + '\n'

gulp-help-doc/gulp-help-doc.d.ts

@@ -10,7 +10,7 @@
 declare module "gulp-help-doc" {
 
     import gulp = require('gulp');
-    import Promise = require('es6-promise');
+    import promise = require('es6-promise');
 
     namespace usage {