graphite: auto detect version

public/app/core/utils/version.ts

@@ -1,4 +1,6 @@
-const versionPattern = /(\d+)(?:\.(\d+))?(?:\.(\d+))?(?:-([0-9A-Za-z\.]+))?/;
+import _ from 'lodash';
+
+const versionPattern = /^(\d+)(?:\.(\d+))?(?:\.(\d+))?(?:-([0-9A-Za-z\.]+))?/;
 
 export class SemVersion {
   major: number;
@@ -20,6 +22,10 @@ export class SemVersion {
     let compared = new SemVersion(version);
     return !(this.major < compared.major || this.minor < compared.minor || this.patch < compared.patch);
   }
+
+  isValid(): boolean {
+    return _.isNumber(this.major);
+  }
 }
 
 export function isVersionGtOrEq(a: string, b: string): boolean {