Removed not needed deps

Removed
* github.com/gogits/cache
* github.com/gogits/session

.gopmfile

@@ -14,11 +14,9 @@ github.com/codegangsta/cli =
 github.com/go-sql-driver/mysql = 
 github.com/go-xorm/core = 
 github.com/go-xorm/xorm = 
-github.com/gogits/cache = 
 github.com/gogits/gfm = 
 github.com/gogits/git = 
 github.com/gogits/oauth2 = 
-github.com/gogits/session = 
 github.com/juju2013/goldap = 
 github.com/johnweldon/asn1-ber = 
 github.com/lib/pq =