update bower to 3.8.0

small stability improvment:

	- Download tar archives from GitHub when possible (#2263)

        - Change default shorthand resolver for github from git:// to
https://

	- Fix ssl handling by not setting GIT_SSL_NO_VERIFY=false
(#2361)

src/adhocracy_frontend/checkcode_and_compile.cfg

@@ -149,7 +149,7 @@ inline =
         "devDependencies": {
             "typescript": "1.8.10",
             "tslint": "3.15.1",
-            "bower": "1.7.9",
+            "bower": "1.8.0",
             "jasmine": "2.4.1",
             "protractor": "3.3.0",
             "sync-exec": "0.6.2",