Remove some useless "confidence" stuff (#1895)

* Remove some useless "confidence" stuff

- HHVM implies PHP
- Mattermost can run on Postgre or Mysql, there is no point in showing them both at 50%, we don't do this for anything else
- If something is powered by ASP.NET, it's running ASP.NET
- If there is "Python" in a "Server" header, it's powered by Python
- RiteCMS is running on SQLite by default, it's the whole point of running this CMS instead of something more heavy
- JQuery is a mandatory dependency of typeahead

* @q-- is right, HHVM might imply Hack

I haven't seen any serious website in Hack, except facebook,
so lets go for 75%

* @q-- is right again

> Microsoft IIS will send this header if ASP.NET is installed (by default if you use IIS, I think) even ASP.NET isn't actually used.

src/apps.json

@@ -3437,7 +3437,7 @@
 				"X-Powered-By": "HHVM/?([\\d.]+)?\\;version:\\1"
 			},
 			"icon": "HHVM.png",
-			"implies": "PHP\\;confidence:50",
+			"implies": "PHP\\;confidence:75",
 			"website": "http://hhvm.com"
 		},
 		"HP": {
@@ -5132,9 +5132,7 @@
 			"icon": "mattermost.png",
 			"implies": [
 				"Go",
-				"React",
+				"React"
-				"PostgreSQL\\;confidence:50",
-				"MySQL\\;confidence:50"
 			],
 			"website": "http://about.mattermost.com"
 		},
@@ -6929,7 +6927,7 @@
 				"27"
 			],
 			"headers": {
-				"Server": "(?:^|\\s)Python(?:/([\\d.]+))?\\;confidence:50\\;version:\\1"
+				"Server": "(?:^|\\s)Python(?:/([\\d.]+))?\\;version:\\1"
 			},
 			"icon": "Python.png",
 			"website": "http://python.org"
@@ -7264,7 +7262,7 @@
 			"icon": "RiteCMS.png",
 			"implies": [
 				"PHP",
-				"SQLite\\;confidence:50"
+				"SQLite\\;confidence:80"
 			],
 			"meta": {
 				"generator": "^RiteCMS(?: (.+))?\\;version:\\1"
@@ -8895,7 +8893,7 @@
 			],
 			"env": "^typeahead$",
 			"icon": "Twitter typeahead.js.png",
-			"implies": "jQuery\\;confidence:50",
+			"implies": "jQuery",
 			"script": "(?:typeahead|bloodhound)\\.(?:jquery|bundle)?(?:\\.min)?\\.js",
 			"website": "http://twitter.github.io/typeahead.js"
 		},