use circleci instead of travis (#511)

Upgrade rust-toolchain
Upgrade Tantivy
Warning: tantivy now use a different file format, search index may need to be deleted and recreated to work as intended
try to run compile twice in a row because sometime oomk is evil

src/routes/search.rs

@@ -59,10 +59,10 @@ pub fn search(
     user: Option<User>,
     intl: I18n,
 ) -> Ructe {
-    let query = query.map(|f| f.into_inner()).unwrap_or_default();
+    let query = query.map(Form::into_inner).unwrap_or_default();
     let page = query.page.unwrap_or_default();
     let mut parsed_query =
-        Query::from_str(&query.q.as_ref().map(|q| q.as_str()).unwrap_or_default())
+        Query::from_str(&query.q.as_ref().map(String::as_str).unwrap_or_default())
             .unwrap_or_default();
 
     param_to_query!(query, parsed_query; normal: title, subtitle, content, tag,