Read-only support, version 1.0
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Committed:
* hg log
  user, date, branch, limit
  filename(multiple?)
  
* hg manifest (aka ls)
  
* hg status

* hg cat

Proposed:
- LogCommand.revision(int... rev)+ to walk selected revisions only (list->sort(array) on execute, binary search)
- LogCommand.before(Date date) and .after()
- LogCommand.match() to specify pattern, no selected file()s only?  

Read-only support, version 1.1
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