Readded cron requirement for daily builds

.travis.yml

@@ -50,7 +50,9 @@ stages:
   - name: gallery_dev
     if: tag =~ ^v(\d+|\.)*[a-z]\d*$
   - name: docs_daily
+    if: type = cron
   - name: gallery_daily
+    if: type = cron
 
 jobs:
   include:
@@ -147,7 +149,7 @@ jobs:
       env: DESC="docs" CHANS_DEV="-c pyviz/label/dev" HV_DOC_HTML='true' HV_DOC_GALLERY='false' HV_REQUIREMENTS="doc"
       script:
         - bokeh sampledata
-        - nbsite generate-rst --org pyviz --project-name holoviews --offset 0 --skip ^reference
+        - nbsite generate-rst --org pyviz --project-name holoviews --skip ^reference
         - nbsite build --what=html --output=builtdocs
       after_success:
         - pip install awscli