Updated docs (#48)

* Added docs + tests for spec
* Updated WireMock tests for docs
* Made wiremock tests dynamic

spring-cloud-contract-spec/src/test/groovy/org/springframework/cloud/contract/spec/internal/ContractSpec.groovy

@@ -0,0 +1,80 @@
+package org.springframework.cloud.contract.spec.internal
+
+import org.springframework.cloud.contract.spec.Contract
+import spock.lang.Specification
+/**
+ * @author Marcin Grzejszczak
+ */
+class ContractSpec extends Specification {
+
+	def 'should work for http'() {
+		when:
+			Contract.make {
+				request {
+					url('/foo')
+					method('PUT')
+					headers {
+						header([
+						        foo: 'bar'
+						])
+					}
+					body([
+					        foo: 'bar'
+					])
+				}
+				response {
+					headers {
+						header([
+								foo2: 'bar'
+						])
+					}
+					body([
+							foo2: 'bar'
+					])
+				}
+			}
+		then:
+			noExceptionThrown()
+	}
+	def 'should work for messaging'() {
+		when:
+			Contract.make {
+				input {
+					messageFrom('input')
+					messageBody([
+							foo: 'bar'
+					])
+					messageHeaders {
+						header([
+								foo: 'bar'
+						])
+					}
+				}
+				outputMessage {
+					sentTo('output')
+					body([
+							foo2: 'bar'
+					])
+					headers {
+						header([
+								foo2: 'bar'
+						])
+					}
+				}
+			}
+		then:
+			noExceptionThrown()
+	}
+
+	def 'should generate a value if only regex is passed for client'() {
+		given:
+			Request request = new Request()
+			DslProperty property
+		when:
+			request.with {
+				property = value(consumer(regex("[0-9]{5}")))
+			}
+		then:
+			(property.serverValue as String).matches(/[0-9]{5}/)
+	}
+}