travis: make FUSE work for cammount tests

Change-Id: Ieb84446571dfea3eb44c07a8ed2f3ff7a874f817

.travis.yml

@@ -1,8 +1,15 @@
+sudo: required
+dist: trusty
 go_import_path: camlistore.org
 language: go
 go:
   - 1.5
   - tip
+before_install:
+  - sudo apt-get install -qq pkg-config fuse
+  - sudo modprobe fuse
+  - sudo chmod 666 /dev/fuse
+  - sudo chown root:$USER /etc/fuse.conf
 install: GO15VENDOREXPERIMENT=1 go run make.go -v
 before_script: GO15VENDOREXPERIMENT=1 go build -o ./bin/devcam ./dev/devcam
 script: GO15VENDOREXPERIMENT=1 ./bin/devcam test