Plugin execution order is unable to be specified.

[davemo]

In releasing https://github.com/linemanjs/lineman-vendor-split I encountered a bug using the lineman-angular plugin in conjunction with lineman-vendor-split; users are unable to control the execution order of plugins.

The problem manifests itself in a project using lineman-angular due to the fact that the concat_sourcemap config is modified by both plugins yet lineman-angular expects lineman-vendor-split to go first so that the config is setup appropriately to modify.

Discussion with @searls has yielded a couple of options for users being able to define this, the simplest being simply exporting a function from a plugin that is then required in the config/application.{js,coffee} of the users lineman application.

ie:

module.exports = (lineman) ->
    require('lineman-vendor-split')(lineman.application.config) #mutates the config
    # other normal app config here
    server:
      enabled: true
    # etc

[searls]

If we want to take a serious look at this, the first step is probably reacquainting ourselves with the code that currently discovers plugins. It may provide a little insight into how ordering works now