Persist ganache DB and use fixed Mnemonic

This persists the state of the ganache db and uses a fixed mnemonic
code to create accounts.
It now acts more like a local presistent database and no need to
send funds to the accounts after restart.

.gitignore

@@ -1,2 +1,3 @@
 build
 node_modules
+.ganache-db

package.json

@@ -9,7 +9,7 @@
   "scripts": {
     "build-json": "truffle compile && node ./scripts/build-json.js",
     "bootstrap": "truffle migrate --reset && truffle exec scripts/seeds.js && npm run build-json",
-    "ganache": "ganache-cli -p 7545 -i 100",
+    "ganache": "ganache-cli -p 7545 -i 100 --db=./.ganache-db -m kredits",
     "dev": "truffle migrate && npm run build-json",
     "test": "echo \"Error: no test specified\" && exit 1"
   },