Add stash scraper type (#269)

* Add stash scraper type

* Add graphql client to vendor

* Embed stash credentials in URL

* Fill URL from scraped scene

* Nil IDs returned from remote stash

* Nil check

vendor/github.com/shurcooL/graphql/scalar.go

@@ -0,0 +1,51 @@
+package graphql
+
+// Note: These custom types are meant to be used in queries for now.
+// But the plan is to switch to using native Go types (string, int, bool, time.Time, etc.).
+// See https://github.com/shurcooL/githubv4/issues/9 for details.
+//
+// These custom types currently provide documentation, and their use
+// is required for sending outbound queries. However, native Go types
+// can be used for unmarshaling. Once https://github.com/shurcooL/githubv4/issues/9
+// is resolved, native Go types can completely replace these.
+
+type (
+	// Boolean represents true or false values.
+	Boolean bool
+
+	// Float represents signed double-precision fractional values as
+	// specified by IEEE 754.
+	Float float64
+
+	// ID represents a unique identifier that is Base64 obfuscated. It
+	// is often used to refetch an object or as key for a cache. The ID
+	// type appears in a JSON response as a String; however, it is not
+	// intended to be human-readable. When expected as an input type,
+	// any string (such as "VXNlci0xMA==") or integer (such as 4) input
+	// value will be accepted as an ID.
+	ID interface{}
+
+	// Int represents non-fractional signed whole numeric values.
+	// Int can represent values between -(2^31) and 2^31 - 1.
+	Int int32
+
+	// String represents textual data as UTF-8 character sequences.
+	// This type is most often used by GraphQL to represent free-form
+	// human-readable text.
+	String string
+)
+
+// NewBoolean is a helper to make a new *Boolean.
+func NewBoolean(v Boolean) *Boolean { return &v }
+
+// NewFloat is a helper to make a new *Float.
+func NewFloat(v Float) *Float { return &v }
+
+// NewID is a helper to make a new *ID.
+func NewID(v ID) *ID { return &v }
+
+// NewInt is a helper to make a new *Int.
+func NewInt(v Int) *Int { return &v }
+
+// NewString is a helper to make a new *String.
+func NewString(v String) *String { return &v }