Fix go-bindata error in Travis build

Based on @sheenobu's work on #58

.gitignore

@@ -3,6 +3,7 @@
 *.swo
 
 build
+tmp
 *.ini
 *.db
 

.travis.yml

@@ -5,3 +5,5 @@ go:
 
 env:
   - GO111MODULE=on
+
+script: make ci

Makefile

@@ -9,9 +9,13 @@ GOGET=$(GOCMD) get
 BINARY_NAME=writefreely
 DOCKERCMD=docker
 IMAGE_NAME=writeas/writefreely
+TMPBIN=./tmp
 
 all : build
 
+ci: ci-assets deps
+	cd cmd/writefreely; $(GOBUILD) -v -tags='sqlite'
+
 build: assets deps
 	cd cmd/writefreely; $(GOBUILD) -v -tags='sqlite'
 
@@ -107,8 +111,18 @@ generate :
 		$(GOGET) -u github.com/jteeuwen/go-bindata/...; \
 	fi
 
+$(TMPBIN):
+	mkdir -p $(TMPBIN)
+
+$(TMPBIN)/go-bindata: deps $(TMPBIN)
+	$(GOBUILD) -o $(TMPBIN)/go-bindata github.com/jteeuwen/go-bindata/go-bindata
+
+ci-assets : $(TMPBIN)/go-bindata
+	$(TMPBIN)/go-bindata -pkg writefreely -ignore=\\.gitignore schema.sql sqlite.sql
+
 clean :
 	-rm -rf build
+	-rm -rf tmp
 	cd less/; $(MAKE) clean $(MFLAGS)
 
 force_look :