[namespaced-rake-tasks] RakeTaskManager: convert ':' -> '/' (rake namespaces)
[namespaced-rake-tasks] TaskToWebBuilder has been relying on 'tasks'

This goes red, and it shouldn't.

Trying to eliminate "tasks" and just stick with "names."
[namespaced-rake-tasks] Eliminate TaskManager.tasks. It's just .names now.
[namespaced-rake-tasks] Eliminate RakeTaskManager.tasks.
[namespaced-rake-tasks] Eliminate building OpenStruct around names

Initially, RakeTaskManager and TaskToWebBuilder were a single object.

This means that TaskToWebBuilder (and the associated views) was likely
to "know" stuff specific to Rake tasks, and sure enough, the
RakeTaskManager knew that Rake tasks responding to a "name" method,
and this proliferated a wee bit.

This commit eliminates this. It's now a TaskManager's job to only
provide a list of named tasks (as strings) and know how to execute
those tasks when handed back a string.
Merge pull request #4 from jedcn/namespaced-rake-tasks

Support Namespaced Rake Tasks