Support self signed certificate

[tranmh]

Hi,

in certain situation it is not possible to have a valid certificate, i.e. because it is self signed and you are in a testing environment. Nonethless I would like to have the watchdog support. So therefore I follow this question:
https://stackoverflow.com/questions/12122159/how-to-do-a-https-request-with-bad-certificate
and change watchdog-tomcat.go adding InsecureSkipVerify: true.

Would you please so kind and bring my change to branch master? Thx.

Here is the diff:

diff --git a/watchdog-tomcat.go b/watchdog-tomcat.go
index cf792d3..5621d23 100644
--- a/watchdog-tomcat.go
+++ b/watchdog-tomcat.go
@@ -7,6 +7,7 @@ import (
     "fmt"
     "io"
     "net/http"
+    "crypto/tls"
     "os"
     "os/exec"
     "strconv"
@@ -70,7 +71,11 @@ func runWatchedApp(application string) (pid int, err error) {
 }
 
 func healthCheck(check_url string, timeout time.Duration) (bool, error) {
+    tr := &http.Transport{
+        TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
+    }
     var netClient = &http.Client{
+        Transport: tr,
         Timeout: time.Second * timeout,
         CheckRedirect: func(req *http.Request, via []*http.Request) error {
             return http.ErrUseLastResponse