chore(pubspec.lock): upgraded route_hierarchical to 0.4.15
chore(manager.js): add script to patch manager.js

Add utility script to address issue reported
[here](https://groups.google.com/forum/#!topic/angular-dart/hYY8WN_5OQc)
: `ERROR [karma]: [Error: error:24064064:random number
generator:SSLEAY_RAND_BYTES:PRNG not seeded]`.