Add elm-verify-examples setup and examples

Closes #6.

.gitignore

@@ -2,3 +2,5 @@
 elm-stuff
 # elm-repl generated files
 repl-temp-*
+# elm-verify-examples
+tests/VerifyExamples

src/Semver.elm

@@ -133,13 +133,21 @@ compare versionA versionB =
 
 
 {-| Shorthand for determining whether `versionA` precedes `versionB`.
+
+    lessThan (version 1 0 0 [] []) (version 2 0 0 [] [])
+    --> True
+
 -}
 lessThan : Version -> Version -> Bool
 lessThan versionA versionB =
     compare versionA versionB == LT
 
 
 {-| Shorthand for determining whether `versionA` is preceded by `versionB`.
+
+    greaterThan (version 2 0 0 [] []) (version 1 0 0 [] [])
+    --> True
+
 -}
 greaterThan : Version -> Version -> Bool
 greaterThan versionA versionB =
@@ -152,9 +160,14 @@ greaterThan versionA versionB =
 
 {-| Produce a version's string representation.
 
+    v : Version
+    v = version 3 2 1 [ "foo", "qux" ] [ "bar" ]
+
+    print v --> "3.2.1-foo.qux+bar"
+
 The output format is such that
 
-    v |> print |> parse == Just v
+    parse (print v) --> Just v
 
 -}
 print : Version -> String
@@ -184,6 +197,9 @@ Parsing fails if the string is not legal according to Semver 2.0.0.
 
 Does not accept loose syntax or prefixes ('v') to the version string.
 
+    parse "3.2.1-foo.qux+bar"
+    --> Just (version 3 2 1 [ "foo", "qux" ] [ "bar" ])
+
 -}
 parse : String -> Maybe Version
 parse versionString =

tests/elm-verify-examples.json

@@ -0,0 +1,4 @@
+{
+  "root": "../src",
+  "tests": ["Semver"]
+}