Add gradle build to hamcrest.

Needed to unblock building espresso with gradle.

Change-Id: Id790c326dfe03993051f957582a412552df9df96
diff --git a/integration/build.gradle b/integration/build.gradle
new file mode 100644
index 0000000..54ab15f
--- /dev/null
+++ b/integration/build.gradle
@@ -0,0 +1,13 @@
+apply plugin: 'java'
+
+sourceSets {
+    main {
+        java {
+            srcDirs = ['src']
+        }
+    }
+}
+
+dependencies {
+    compile project(':hamcrest')
+}
diff --git a/library/build.gradle b/library/build.gradle
new file mode 100644
index 0000000..54ab15f
--- /dev/null
+++ b/library/build.gradle
@@ -0,0 +1,13 @@
+apply plugin: 'java'
+
+sourceSets {
+    main {
+        java {
+            srcDirs = ['src']
+        }
+    }
+}
+
+dependencies {
+    compile project(':hamcrest')
+}