drb wishes
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                 Key: BUILDR-182
                 URL: https://issues.apache.org/jira/browse/BUILDR-182
             Project: Buildr
          Issue Type: Wish
          Components: Extensions
    Affects Versions: 1.3.4
            Reporter: Ittay Dror


Add hooks to Snapshot, so there can be better control over what tasks are 
redefined in each build:
1. some tasks are defined lazily to save performance when buildr runs directly. 
however, for performance reasons i don't want to define them in each subsequent 
run. furthermore, some of those tasks may have logic to not execute in 
subsequent builds under some circumstances.
==> add option to add tasks to the snapshot

2. some tasks may need to recreate their prerequisites in each run. for example 
in C++ a library depends on the obj files from which it is linked. but in each 
run the list of objects needs to be reconstructed to account for changes in the 
files. this can be handled by lazily defining this list (since drb always 
returns the prerequisites to their original state), yet, it may be easier if a 
hook is provided that instructs drb to recreate a task completely in subsequent 
runs.

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