Fixed some weird use of "&" operator

See #7

Author: cmaglie

examples/GsmSSLWebClient/GsmSSLWebClient.ino

@@ -31,7 +31,7 @@ GSMSSLClient client;
 GPRS gprs;
 GSM gsmAccess;
 
-// URL, path & port (for example: arduino.cc)
+// URL, path and port (for example: arduino.cc)
 char server[] = "arduino.cc";
 char path[] = "/asciilogo.txt";
 int port = 443; // port 443 is the default for HTTPS

examples/GsmWebClient/GsmWebClient.ino

@@ -31,7 +31,7 @@ GSMClient client;
 GPRS gprs;
 GSM gsmAccess;
 
-// URL, path & port (for example: arduino.cc)
+// URL, path and port (for example: arduino.cc)
 char server[] = "arduino.cc";
 char path[] = "/asciilogo.txt";
 int port = 80; // port 80 is the default for HTTP

examples/Tools/PinManagement/PinManagement.ino

@@ -71,7 +71,7 @@ void setup() {
       }
     } else if (pin_query == -2) {
       // the worst case, PIN and PUK are locked
-      Serial.println("PIN & PUK locked. Use PIN2/PUK2 in a mobile phone.");
+      Serial.println("PIN and PUK locked. Use PIN2/PUK2 in a mobile phone.");
       while (true);
     } else {
       // SIM does not requires authetication
@@ -110,7 +110,7 @@ void loop() {
     user_input = readSerial();
     // activate/deactivate PIN lock
     PINManager.switchPIN(user_input);
-  } else if (user_op == "2" & PINManager.getPINUsed()) {
+  } else if (user_op == "2" && PINManager.getPINUsed()) {
     Serial.println("Enter your actual PIN code:");
     String oldPIN = readSerial();
     Serial.println("Now, enter your new PIN code:");

examples/Tools/SerialGSMPassthrough/SerialGSMPassthrough.ino

@@ -13,7 +13,7 @@
    - 1500 mAh or higher lipo battery connected
    - SIM card
 
-   Make sure the Serial Monitor's line ending is set to "Both NL & CR"
+   Make sure the Serial Monitor's line ending is set to "Both NL and CR"
 
    create 11 December 2017
    Sandeep Mistry

examples/Tools/TestWebServer/TestWebServer.ino

@@ -47,7 +47,7 @@ void setup() {
   // Start GSM shield
   // If your SIM has PIN, pass it as a parameter of begin() in quotes
   while (!connected) {
-    if ((gsmAccess.begin(PINNUMBER) == GSM_READY) &
+    if ((gsmAccess.begin(PINNUMBER) == GSM_READY) &&
         (gprs.attachGPRS(GPRS_APN, GPRS_LOGIN, GPRS_PASSWORD) == GPRS_READY)) {
       connected = true;
     } else {