Ensure up-to-date dependencies

[matanlurey]

Blocking angulardart/angular#1095.

It's incredibly easy to use an out-of-date set of build_runner, build_web_compilers, and build_test - which, coupled with dart-lang/pub#912, means that users frequently use out of date development dependencies, and when they try and upgrade, hit deadlocks or incomprehensible error messages, i.e (as an example only):

Resolving dependencies...
Package angular_components has no versions that match >=0.9.0-alpha+8 <0.10.0 derived from:
- merck_crm_mashup depends on version ^0.9.0-alpha+8
Process finished with exit code 1

An alternative would be support for peer_dependencies in pub: dart-lang/pub#1837.

[grouma]

Closing as there is no work for us to do.

We have logic to ensure that the required build_runner, build_web_compilers and even build_daemon packages are used. With the recent changes to pub, the errors are not as cryptic.

I agree in an ideal world we would make use of peer_dependencies but I don't think those are coming any time soon..