Add comprehensive test suite — 81% cross-package coverage

Bug fixes:
- config: remove unused log import
- item: fix Printf format %d->%t for boolean ReadState
- util: update stale config.Read -> config.Init, remove config.Config.DBServer

Test files added:
- config/config_test.go: Init, readConfig, addDefaults (100%)
- vlog/vlog_test.go: Printf, Println verbose/silent (100%)
- models/db_test.go: InitDB tests
- models/feed/feed_test.go: CRUD, filter, Categories, NewFeed, ResolveFeedURL (87%)
- models/item/item_test.go: CRUD, Filter with category/search/starred, rewriteImages (71%)
- exporter/exporter_test.go: all export formats (91%)
- importer/importer_test.go: InsertIItem, ImportJSON (90%)
- crawler/crawler_test.go: GetFeedContent, CrawlFeed, CrawlWorker, Crawl (89%)
- web/web_test.go: auth, login/logout, stream, item, feed, category,
  export, crawl, imageProxy handlers (77%)

Remaining 0% functions require HTTP/rice.MustFindBox/main entry and
can't be unit tested without refactoring (see tickets NK-gqkh96, NK-6q9nyg).

1 files changed, 6 insertions, 5 deletions

diff --git a/models/item/item.go b/models/item/item.go
index 500fec9..9639595 100644
--- a/models/item/item.go
+++ b/models/item/item.go
@@ -1,16 +1,17 @@
 package item
 
 import (
+	"encoding/base64"
+	"fmt"
+	"strings"
+
 	"adammathes.com/neko/config"
 	"adammathes.com/neko/models"
 	"adammathes.com/neko/vlog"
-	"encoding/base64"
-	"fmt"
 	"github.com/PuerkitoBio/goquery"
-	"github.com/advancedlogic/GoOse"
+	goose "github.com/advancedlogic/GoOse"
 	"github.com/microcosm-cc/bluemonday"
 	"github.com/russross/blackfriday"
-	"strings"
 )
 
 type Item struct {
@@ -37,7 +38,7 @@ type Item struct {
 func (i *Item) Print() {
 	fmt.Printf("id: %d\n", i.Id)
 	fmt.Printf("title: %s\n", i.Title)
-	fmt.Printf("ReadState: %d\n", i.ReadState)
+	fmt.Printf("ReadState: %t\n", i.ReadState)
 }
 
 func (i *Item) Create() error {