Verify sketches as part of travis build

Squashed commits:
[7d1b42f] Encrypt token, skip some tests
[17b8f39] Fix sha1 example path
[f3050b1] Fix build, add webhook
[fd2c9bd] Fix build errors, update mDNS library readme
[7b87031] Make common.sh more flexible
[3ba3eb2] Test all sketches
[87beb8a] Build all sketches in esp8266 core
[f2464f1] Fix paths
[823a9ae] Remove sudo usage
[7fce734] Fix arduino commands
[619bc7d] Move all commands into travis script
[15a5ada] First attempt test runner

libraries/Hash/examples/sha1/sha1.ino

@@ -1,32 +1,32 @@
-/**
- * simple demo to show sha1 calculation
- */
-#include <Arduino.h>
-#include <Hash.h>
-
-void setup() {
-    Serial.begin(921600);
-}
-
-void loop() {
-
-    // usage as String
-    // SHA1:a94a8fe5ccb19ba61c4c0873d391e987982fbbd3
-
-    Serial.print("SHA1:");
-    Serial.println(sha1("abc"));
-
-    // usage as ptr
-    // SHA1:a94a8fe5ccb19ba61c4c0873d391e987982fbbd3
-    uint8_t hash[20];
-    sha1("abc", &hash[0]);
-
-    Serial.print("SHA1:");
-    for(uint16_t i = 0; i < 20; i++) {
-        Serial.printf("%02x", hash[i]);
-    }
-    Serial.println();
-
-    delay(1000);
-}
-
+/**
+ * simple demo to show sha1 calculation
+ */
+#include <Arduino.h>
+#include <Hash.h>
+
+void setup() {
+    Serial.begin(921600);
+}
+
+void loop() {
+
+    // usage as String
+    // SHA1:a94a8fe5ccb19ba61c4c0873d391e987982fbbd3
+
+    Serial.print("SHA1:");
+    Serial.println(sha1("abc"));
+
+    // usage as ptr
+    // SHA1:a94a8fe5ccb19ba61c4c0873d391e987982fbbd3
+    uint8_t hash[20];
+    sha1("abc", &hash[0]);
+
+    Serial.print("SHA1:");
+    for(uint16_t i = 0; i < 20; i++) {
+        Serial.printf("%02x", hash[i]);
+    }
+    Serial.println();
+
+    delay(1000);
+}
+