Drop Go 1.0 from travis.yml, not supported

* Go 1.0 net/url ResolveReference behaved differently and did not
meet RFC 3986 with regard to '..' collapsing, empty strings, etc.
* golang/go#4706

.travis.yml

@@ -1,6 +1,5 @@
 language: go
 go:
-  - 1.0
   - 1.1
   - 1.2
   - 1.3

sling.go

@@ -39,12 +39,11 @@ func New() *Sling {
 // Copy Creation
 
 // New returns a copy of the Sling. This is useful for creating a new,
-// mutable Sling with properties from a base Sling.
+// mutable Sling with properties from a base Sling. For example,
 //
-// For example,
-// baseSling := sling.New().Client(client).Base("https://api.io/")
-// fooSling := baseSling.New().Get("foo/")
-// barSling := baseSling.New().Get("bar/")
+// 	baseSling := sling.New().Client(client).Base("https://api.io/")
+// 	fooSling := baseSling.New().Get("foo/")
+// 	barSling := baseSling.New().Get("bar/")
 //
 // fooSling and barSling will send requests to https://api.io/foo/ and
 // https://api.io/bar/ respectively and baseSling is unmodified.